Diamond informatiion

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PinkDiamond
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Re: Diamond informatiion

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DeBeers is going into the used diamond business; let's hope this doesn't end up like the used car business where we'll need 'Diamond Fax'. :lol:

De Beers Now Valuing, Buying Diamond Trade-Ins
By Rob Bates, Senior Editor - Posted on August 19, 2014

"The new De Beers is many things: a miner, marketer, retailer, and brand owner. Now it also may become a secondhand diamond dealer.

The gem giant has launched the International Institute of Diamond Valuation (IIDV), a New York City–based lab meant to handle off-the-street diamond buying for retailers.

“All the research we have done indicates that the consumer experience with secondhand diamonds isn’t that good at the moment,” says De Beers spokesperson Lynette Gould.

De Beers’ solution is the IIDV, which will provide two services for retailers who have customers who want to resell diamonds. In the first, ..."


http://www.jckonline.com/2014/08/19/de- ... -306540353
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Re: Diamond informatiion

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232 Carat D-Color Diamond Unearthed in South Africa
By Rob Bates, News Director - Posted on September 9, 2014

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Courtesy: Petra Diamonds.
The 232 Ct. Stone

"It’s big, it’s colorless, and it just might be flawless.

In a year filled with notable diamond finds, Petra Diamonds has unearthed a particularly impressive stone—a 232 ct. D-color stone with “exceptional clarity.”


“The diamond is practically see-through, so it is very likely to produce a flawless stone,” says Petra spokesperson Cathy Malins.

She describes the rough as “the size of a strawberry.”

The type IIa stone was discovered at Petra’s Cullinan mine in South Africa, which was purchased from De Beers in 2008. It has not been determined when the stone will be sold."


http://www.jckonline.com/2014/09/09/232 ... -306540353
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Re: Diamond informatiion

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The Tuesday night ISG chat covered this, and today RJ put it all together in a newsletter so I'm able to post it here for you. I think you'll find it very interesting and enjoy the information it provides. Thank you ISG!

History of Diamonds Part I

From rainstorms in India to the Jewish diamond connection

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Diamonds. The very name conjures up visions of wealth, intrigue, and fortunes. Are they real or imagined? Is diamond really the "King of Gems" as claimed by many advertisements? And is it really true that Diamonds are Forever ™, as claimed in the now famous ad slogan created by N. W. Ayers in the 1940s that has been voted one of the best ad slogans of the Twentieth Century?

The truth is diamonds have a rather shady past…and uncertain future. Why…because the entire diamond market has been based on a monopoly market system that has lasted for over 100 years. In fact it is one of the only monopolistic markets that has survived and flourished within the structure of the modern capitalistic world economy. But before we talk about the current and future status of the diamond markets, let's go back in time a bit and understand just how these crystals of pure carbon became such a mainstay in the world economy.

Golconda Diamonds

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India was the place of original discovery of diamonds dating back almost 2400 years ago. In fact, until the 1730s India was the world's only known source of diamonds. The diamonds were first found in fields after thunderstorms had moved through the area of central India. The locals believed that the diamonds were formed by lightning strikes hitting the ground, and were therefore considered to be a gift from the gods. It was unknown to these early diamond gatherers that they actually lived over a colluvial deposit of diamonds, which is a deposit close to a diamond pipe where the diamonds were being re-deposited by wind and rain. And when the thunderstorms moved across the area, the rain would wash away a layer of the top soil thereby exposing the diamonds contained in the ground deposits. As these thunderstorms produced a lot of lightning strikes, it was therefore assumed that these lightning strikes actually created the diamonds.

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It is important to know that the world's most important diamonds came from the Golconda region of India. Names such as the Koh-i-Noor, the Orlov, the Hope and the Sancy diamonds all came from this region. And to this day, these diamonds are considered the finest diamonds in the world. Virtually all of these diamonds came from the alluvial deposits in the Golconda region, and it was only with the find of the prime source at the Majhgawab lamproite diamond bearing volcanic pipe, that the true source of the Indian diamonds was finally known. And to this day, the Indian diamond deposits produce almost 20,000 carats
annually...after almost 2400 years of production! The Golconda name is often used to refer to the finest quality diamonds since the deposits there produced some of the finest in the world. As a result, on occasion you may get a customer who requests a "Golconda diamond," so you should be aware of this name and the history behind it.

Brazil and Fluctuations in the Diamond Supply

As the European demand for diamonds grew at a fast pace, the production of the Indian diamond deposits began to dwindle by comparison. A new source was needed, and was found by accident. In 1725 a group of gold miners working alluvial deposits in the mountains of Brazil stumbled upon an area that produced diamonds mixed in with their gold ore. A new diamond source had been found!

There were two aspects of the Brazilian diamond find that proved to be important. First, once formal diamond prospecting was begun, it was found that many areas of Brazil produced diamonds. In fact, no less than 12 regions encompassing the entire country produced diamonds in various qualities and quantities. These ranged all the way from the southern region outside of Sau Paulo, to an area that encompassed the entire Amazon River delta. Second was the fact that Brazil was able to produce a huge amount of diamonds from her many sources. So many, in fact, that there were more diamonds being produced than the European markets could absorb. The result? Diamond market prices fell by almost 70% shortly after the Brazilian diamond discovery.

With the availability of a huge source of diamonds at cheap prices, the demand for diamonds in Europe increased. And eventually the easily mined alluvial diamond deposits in Brazil started to diminish as the deposits were worked out. This caused an eventual shortage of rough diamonds in a market of huge demand, which in turn caused prices to increase dramatically. As is the case in any economy of supply and demand, the sudden decrease in diamond availability in the late 1740s, and the ensuing dramatic increase in price, caused the diamond markets to virtually collapse, as only the very rich could afford to own diamonds once again.

The Age of Mercantilism

An interesting fact about 18th century European economies would make an impact on the diamond markets in the mid-1740s that lasts to this day. During this time the main economic theory was not one of capitalism, but instead one of mercantilism. Mercantilism was Europe's first effort to establish international trading partners and build a national wealth. The key was that certain trades, such as ship building and banking, were far more profitable than being a cobbler (shoe maker) or cartwright (one who makes carts). The result was that those who established themselves in ship building would want their children to also have the ship building business. Not just to carry on the family tradition, but to carry on the family wealth.

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The result of mercantilism was that many trades of the day became family heirlooms. The knowledge and trade would simply be passed down from father to son, and it was understood that the son of a cobbler would be become a cobbler. And the son of a banker would become a banker. The problem was that if you were born into a cobbler's family...you were stuck. That was what you were expected to do. That was the trade you were taught because you spent your growing up years learning the trade from your father, who learned it from his father, and so on. And you were expected to carry on the tradition and teach it to your son.

One of the facts about mercantilism was that once your family was involved in a business, you were pretty much there the rest of your life. And there were trades that no one wanted to do...either because they were demeaning, or because they did not make any money. In 1740 Europe, diamonds did not make any money. The supplies were gone, the cutting ability was not well advanced due to lack of technology, and the future of the diamond markets was quite glum as both the Indian and Brazilian deposits were virtually wiped out with no more known sources on which to draw.

It was also during this time that most European countries were monarchies. Meaning that the king or queen wielded a lot of power. So much that they could decide who was awarded what level on the mercantilism ladder of respectability and profitability. And since the Jewish communities of most European countries were considered of low status, it was determined to limit the Jewish ability to enter into a profitable trade. So....the Jews were severely limited as to what trades they could enter in an effort to insure that they had the lowest economic potential of the day. And in 1740 Europe, one of the most unprofitable trades you could work in was....diamond cutter or diamond merchant. So, one of the few mercantile trades that Jewish workers were allowed to work in was...diamonds.

What the mercantilism system did not anticipate, however, was that in 1850 another major diamond discovery would be made in the Bahia region of Brazil. And once again the diamond markets flourished as both supply and demand was up significantly. Of course by this time the only people who were involved in the diamond markets were members of the Jewish communities...everyone else abandoned the trade as it had become something of a low status trade. And it was with few exceptions that only the Jewish diamond cutters knew how to properly cut diamonds, so they flourished along with the new diamond demand throughout Europe. Something quite the opposite of what the governing powers expected at the time. And in spite of a depressed market in the early 1860s, the theory of mercantilism ensured the Jewish community a thriving trade, now centered in the Belgian town of Antwerp, as the art of diamond cutting was passed down father to son within their families. And due to it taking many years to learn how to properly cut a diamond, this system served quite well as master diamond cutters were able to start their training at a very young age as they helped with the family business.

But the real impact was just beginning...

Coming next week in Part II: South Africa Diamond Discovery to the DeBeers Monopoly...and beyond!
This story is excerpted from the ISG Diamonds Course. We invite you to join us for the more fun, rewarding and affordable study of gemology in the world. Click the link below to visit the ISG Website:

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http://www.schoolofgemology.com/




Lydia wrote:Thanks Pink! Fascinating.


crazy8s wrote:Thanks Pink :!: :D


SwordfishMining wrote:The Indian government is going to flood the entire area with a new dam. https://www.youtube.com/watch?v=P1b06tEHl-0&feature=youtu.be


That's sad John, but I would imagine the pipe isn't producing much or they wouldn't want to do that. Bummer. :?
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Re: Diamond informatiion

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The History of Diamonds Part 2
The continuing story of diamonds, excerpted from the ISG Diamonds Course....

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On a December day in 1866, a young man named Erasmus Jacobs found a transparent and very shiny stone on his father's farm that was located alongside the Orange River. This turned out to be the first of what would become an avalanche of diamonds from the South African mines, and would start one of the world's greatest monopolies that would last for over 100 years. There were two important events that combined to make this one of the most momentous events in world economic history.

First, it proved to be the greatest find of diamond deposits in the history of the world. According to many sources, the South African mines produced more diamonds in the next 15 years than the Indian deposits had produced in 2,000 years. The African diamond deposits proved to be extremely wide spread, and extremely rich.

The second event was the ending of the Civil War in the United States that ushered in a period of great prosperity and a resultant high demand for diamond jewelry. Plus...with the industrial age just now dawning, the demand for diamonds for industrial purposes was also growing. These were joined with an already healthy diamond market established in Europe. Together they all created a huge demand for diamonds. And many men got on ships of all shapes and sizes heading to the South African diamond fields to make their fortunes.

Until now, the majority of diamonds found were in alluvial deposits. But with the South African diamond discovery, the alluvial deposits could be traced up river until the prime source was found. These were called kimberlite pipes, and were the remnants of ancient volcanoes that had discharged the diamonds from deep inside the earth millions of year earlier. But more on that in a later lesson. For now it will be important for you to know that the South African diamond deposits were traced back to their original source, and now diamonds could be dug from the earth...rather than just washed from a stream bed.

The problem became one of too many people trying to dig too many diamonds out of relatively small places in the ground. The main mining effort was at the Kimberley mine which at the time was the largest diamond mine in the world. Each miner was able to stake a claim measuring 31 feet or 9.44 meters square. And since everyone had different methods of mining encompassing variable numbers of helpers and variable techniques, each claim was worked at different speeds. And different mining speeds meant that the claims dug into the earth at different rates. This allowed some claims to quickly be several meters deeper than the one next to it, allowing for a very dangerous situation as the higher would collapse onto the lower. Clearly something needed to be done to make the mining more uniform, more profitable and less dangerous.

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Above and below you see the amazingly convoluted mining operations at the Kimberley Mine before the claims were unified into the DeBeers Consolidated Mining company. These claims were worked at different rates creating a very dangerous situation for the miners.

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Enter Cecil Rhodes and Barney Barnato.

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These two gentlemen arrived in South Africa in the early 1870s and separately began a process of accumulating claims from other miners in an effort to gain overall control of the Kimberley mine. The concept being that a single unified effort at mining would be more profitable, and bring the control of the distribution of diamonds under a single office. The market could then be better controlled as the supply of diamonds would be controlled by one man rather than a huge number of individual miners.

The ensuing battle between these two men has been the subject of many books, and is a story worthy of your continued research. The fight for control of the Kimberley mine was nasty in size and scope, encompassing many legal battles and bar room brawls. But the necessity of a unified mining effort was further confirmed when the mine reached a particular depth and ground water began flooding vast areas of the mine. Many miners were quick to sell their claims as they believed there was no longer any reason to own that claim. But the truth was that Cecil Rhodes had a plan to pump the water from the deepening claims, thereby making them continue to produce profits far in excess of the bargain prices he had paid the others who had given up on them.

Eventually, Cecil Rhodes won the battle of control of the Kimberley mine and bought out his rival, Barney Barnato, for a price of what would be over US$25,000,000.00 in today's dollars to consolidate the Kimberley mine into single ownership. This was the birth of the De Beers Consolidated Mines Company which exists to this day.

Central Selling Organization

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Of course, for the De Beers Consolidated Mines to have real control of their distribution, it was required that they not have to deal with all of the small time diamond merchants in order to sell their production. So in true form to the legacy of Cecil Rhodes, a unified distribution network was established between De Beers Consolidated Mines in South Africa, and what was known as the Central Selling Organization in London. The CSO, as it was called, was established to serve as the distribution channel for the diamonds, and to help control the market and prices of diamonds. This organization served to control virtually the entire world production of diamonds…since virtually all came from the South African mines owned by De Beers...by withholding rough when prices were low, and selling more rough when prices were higher. This established De Beers as holding a monopoly on the world diamond markets, a matter of great concern to the US government since monopolies are against the law in the USA.

The result was that De Beers could not directly do business in the United States, in spite of the fact that the US had become its biggest customer. The US jewelers were by far the driving force behind the world demand for diamonds, and yet the De Beers organization could not participate in the market. So for many years the De Beers organization paid the US advertising company, N. W. Ayers, to handle their public relations and promotion of diamonds in the United States. In fact, it was N.W. Ayers who come up with the famous De Beer's slogan: A Diamond is Forever.™ With the mines under their control, the distribution under their control, the prices under their control, and the marketing under their control, De Beers finally had a complete and utter monopoly on the world diamond markets. .........And here is where the story turned a bit ugly.

World War II

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With the outbreak of World War II came a world wide demand for many commodities to power the war machines of the Allied and Axis powers. One of these commodities was industrial grade diamonds needed for grinders and cutting blades to speed up production of war machines. And..you guessed it...De Beers controlled the whole world's production of industrial grade diamonds. And since De Beers was only interested in who was willing to pay the most for their products, and not so much on what their customer's politics were, the scramble for industrial grade diamonds put great amounts of profits into the pockets of the De Beers owners regardless of who made the purchase.

Although this did not sit well with the US government, they were relying on the US industrial complex to provide some alternatives to De Beer's strangle hold on this important war time commodity. Enter General Electric.

The General Electric company set about to create the world's first synthetic diamonds. Many other gemstones had been synthesized for many decades. So it was only natural to believe that diamonds could also be synthesized, thereby taking the De Beers monopoly out of the production chain and saving the US government millions of dollars. And the GE company was successful...to a point. Although they were able to synthesize diamonds, they reported that they were not able to do so in the volume and quality required for military and industrial purposes. But this turned out not to be totally true....

What was later found out was that De Beers had actually conspired with GE to keep the new synthetic diamonds off the market so that De Beers would not lose their monopoly. And long after the situation occurred the nature of De Beers involvement was found out, and De Beers was charged with crimes against the United States by way of their monopoly over the diamond markets. For some reason, GE was never really brought to task over this matter, or so it has been reported.

The actual events after the revelation of this situation are still up to interpretation as there are many stories surrounding the issue. But one thing was certain, no officer of the De Beers company could enter into the United States without being immediately arrested. And for many decades the Central Selling Organization had to do business in the US from a distance and through third parties because they could not set foot inside any US property for fear of arrest.

In 2004 De Beers finally pleaded guilty to the price fixing of industry diamonds that dated back to the World War II events and continues until current times. De Beers paid a US$10 million dollar fine and cleared the way to enter into the United States market as a formal business presence. It was during this time that De Beers ceased using the name and structure of the Central Selling Organization and formed the Diamond Trading Company.

It is the DTC that now oversees the sale and distribution of rough diamonds from many world sources. And what about De Beers?

After many decades of making billions of dollars from operating a monopoly of the diamond markets to wholesalers and retail jewelers, De Beers is now going into the retail business in competition with their own clients through their De Beers retail jewelry stores that recently opened in New York and other locations.

Coming Next Week: History of Diamonds Part 3: Conflict Diamonds and Current Markets
To learn more about the world's finest distance education experience in gemology and jewelry appraisal, please click the link below:


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Re: Diamond informatiion

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The final installment of the diamond newsletters from the ISG.

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History of Diamonds Part 3

Conflict Diamonds and the Kimberly Process

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Conflict Diamonds


One of the really ugly stories that has surfaced in the last few years is in regard to what is known as "conflict diamonds" or "blood diamonds". These are diamonds that have come from areas where civil wars are being waged to control the diamond resources of producing countries. The really ugly part is that there is such a nasty fight being waged for that control that local citizens are brutalized by the warring factions in order to maintain control of the area.

The brutality of these conflicts, particularly in Angola and Sierra Leone, has left many children without arms and legs...as one of the methods used to control the local population by the various militias is to sever the limbs of many of the locals to instill fear in everyone. The purpose obviously being to control them by fear so the local population will not assist legitimate government actions to control the problem.

There are many who believe that De Beers is complicit in this problem. Mainly because for many years no diamond of any size could be bought or sold without De Beers being in control of the pipe line somewhere along the way. And given De Beers total control of the diamond markets for many years, there was no way the conflict diamonds would find a market without De Beers being willing to buy them.

How much of this is true? There is a lot of speculation that common sense requires to be taken with a degree of credibility. But actual proof is missing since most of the conflict diamond dealings are strictly clandestine purchases for which there are no records, and very few witnesses willing (and sometimes able) to talk. So the speculation continues.

But one important note: at their greatest level, conflict diamonds are estimated to only have included less then 5% of the diamonds on the market, and today account for less than 1% of the diamonds on the market. Meaning that the chance of having a conflict diamond would be about 1 in 100. Taking into account the concern for those damaged by that 1%, it would also be wrong to throw out the whole diamond industry because of the bad deeds of a few disruptive factions. In order to protect the integrity of the industry many world governments met and created what is now known as the Kimberley Protocol to help control this situation.

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Kimberley Process

The Kimberley Protocol was an agreement by many nations that action was needed to stop the use of diamonds to fund wars and terrorism throughout the world. This protocol gave rise to the Kimberley Process, which are the regulations that have been adopted regarding the sale and distribution of rough diamonds around the world.

The Kimberley Process was implemented in January of 2003, and states that all rough diamonds must come with a certificate of verification, issued by a proper government authority to insure that they are from a non-conflict source. The diamonds must be packed in a specially marked container. And all legitimately registered diamond dealers may only do business with other registered diamond dealers, and all must follow the above rules for all diamond shipments sent and received. The idea is that if the diamond industry only buys diamonds from known sources who are selling government approved diamond rough that has been legitimately verified, that the conflict diamond market will fade away.

Well....this looks good on paper. And it plays well in the media. But many in the diamond industry know that this is going to have little impact on the conflict diamond issue. Currently there is no method available to identify a diamond as being from one source or another...as we can do with rubies, sapphire, etc. Small impurities in colored gemstones allow a fairly easy identification as to their source if one has the proper equipment. Not so with diamonds. As of this writing there is no known method of identifying diamonds based on geographical origin. So it would be very easy for just one unscrupulous diamond dealer to do business with the bad guys and create an inroad into the legitimate diamond markets for conflict sellers.

While that scenario is probably closer to the truth than anyone wants to admit, it is still an extremely small part of the overall diamond market. So much so that the efforts to prevent the problem have almost created a situation where the fix is worse than the problem itself.

The compounded problem is that too many activists want to ruin the whole diamond market for the sake of a few problem diamond sources.

The reason is many activists wanting to blame the entire diamond industry over the actions of a few militias in diamond producing countries that are beyond the control of local government military efforts. And rather than going in and solving the problem of the militias on a military level, all too many people want to blame the diamond industry for the funds received, and try to control the problem through the diamond markets rather than through proper governmental and military action.

The end result is that diamonds and the diamond industry are being blamed for actions beyond our control, which should be dealt with by local governments rather than the world diamond industry.

We can only hope that the Kimberley Process will serve its intended purpose at some point in the future. The last chapter of that story is yet to be written, and probably won’t be for some time to come.

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The Future of the Diamond Market

The future of the diamond industry is in limbo. For while De Beers has controlled distribution and prices for over a century, the fact remains that diamonds are quite plentiful and De Beers is quickly losing that strangle-hold on the markets and prices. Yes, diamond prices continue to hold at fairly average levels, but that is due to a world wide effort to continue the monopolistic pricing structure of the diamond market, thanks in large part to RapNet and its undue influence on world diamond prices. Overall, however, it simply serves every diamond producer’s best interests to abide by the prices set by De Beers in order to maintain some form of market stability. But is that going to last? Only time will tell.

While diamonds may be forever, as the famous N. W. Ayers advertisement for DeBeers claimed, the diamond markets may not be if things continue in the direction they are going.

Without any uniform standards or oversight regarding the diamond industry, this free-for-all concept running the diamond market may just turn into a free-fall reality for the diamond market.

Only time will tell......

We hope you enjoyed this brief overview of the History of Diamonds Parts 1 - 3 from the ISG Diamonds Course. We welcome you to join us for the world's most fun, rewarding and affordable study in gemology and jewelry appraisal.


All can be found at the International School of Gemology
http://www.schoolofgemology.com/

SwordfishMining wrote:I think with the Golconda deposit, they did not ever find the pipe location. All of the Indian mines were effluvial/alluvial.
PinkDiamond
ISG Registered Gemologist


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((¸¸.·´ ..·´ There are miracles left for you to do .... -:¦:- -:¦:-
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Re: Diamond informatiion

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This one's really cool. Enjoy! :D
*I can't get the same format used here on the site, so specimens show above each pic instead of to the left or right of the text as it says.*

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ISG: The Amazing Forms of Diamond
From the ISG Journey Thru Gemology and the ISG Diamonds Course
11 March 2015

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For a few minutes we want you to forget what you know about diamonds. Even you wonderful folks at the CIBJO, IDEX and the World Federation of Diamond Bourses. For a few minutes, let all of it go and join us for a fascinating study of the forms of diamonds. Not the formation....the forms. The amazing shapes that diamonds can take that are not only unusual, but also beautiful and highly marketable. Sit back, relax for a minute and dream about something other than the mundane diamond crystals you see above and in the banner. For a few minutes, join us on a magical mystery tour of just a few of The Amazing Forms of Diamond.

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Sometimes diamonds form....not only together but actually inside each other. These are called interpenetrant crystals, or sometimes inter-growth crystals. When the optical properties line up just right they are often called "twins", or "twinning". But whatever the orientation of the crystals, the fact that diamonds can grow with two or more crystals existing in the same dimensional space is pretty amazing, owing to the fact that the atoms are so far apart in the crystal lattice that the two crystals can grow in the same location and simply join up with each other while holding their own shape. You can see two of these at right.

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Since diamond crystals form in the cubic system, just like pyrite crystals, it's no surprise to find two interpenetrant crystals of these very different materials appearing very much the same: one with pyrite (far left) and the other with diamonds (near left). Part of the amazing world of diamonds that few stop to consider and enjoy.

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When we received the diamond intergrowth at right we had to fire up the Enwave Raman to make sure we had a diamond here. Sure enough, an amazing intergrowth of diamond crystals that pretty much defies the imagination. We do not have the whole story on this one, and yet we have found 2 or 3 of these since. Perhaps one of our readers out there with the WFDB or IDEX can help us out with understanding the form of this

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At left is one of our favorites, and another diamond crystal form that has so far defied any explanation regarding how it formed. Two very specific diamond cube crystals, but what appears to be additional diamond growth material that extends from one to the other, but as an outside growth. All is verified as diamond, but the form of this crystal pair is truly amazing.

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And for those who we know are already asking: yes...diamonds do form as cubes as you have seen above and at right. Perfect cubes. Remember: the cubic system is not called the "cubic" system for nothing. While we are used to seeing the eight sided octahedron diamond crystals, (since most gem quality diamonds form as octahedra), it is not often that you see the cube shapes unless you collect diamond crystals in small sizes as seen at right.

Of course, not all cube diamond crystals are quite so boring as the one above. At left you see a beautiful, and very natural, cube diamond crystal that is very transparent, light brown in color and has the appearance of having been etched at the crystal face junctions.

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There is a growing market for collectors of these types of diamonds, but no.....our's are not for sale. We have too much fun sharing them with you to ever let them go.

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For many of us old folks with gray hair, we remember when the diamonds you see at right were once used to play our 331/3 rpm vinyl records of Pink Floyd or Lynyrd Skynyrd. Record player needles were about as close as we ever got to diamonds of this form...or lack of form might be the better term. Today, however, rough diamonds of what some think of as "low quality" are in high demand as drilled beads for necklaces and jewelry. Below you see two close-up images of these diamond crystals that have been drilled and threaded as diamond bead strands to be used in jewelry designs.

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This is just a peek at the amazing world of unique forms of diamond. There is a growing market interest in these diamonds and the availability is better now than at any time we can remember. Unique! Amazing! Marketable! All of these apply. So we thought that today we would simply take you on a bit of a magical tour through some of the beautiful, and very Amazing Forms of Diamond.


International School of Gemology
http://www.schoolofgemology.com/

crazy8s wrote:8) :D


Rockranger wrote:It was good reading material one late night. :wink: Thanks for posting this, and I look forward to going back to it for resources at some later time if needed. 8)
PinkDiamond
ISG Registered Gemologist


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PinkDiamond
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Re: Diamond informatiion

Post by PinkDiamond »

I'm so glad y'all enjoyed it. Here's what we discussed at Tuesday night's chat. I know y'all will find this one VERY interesting. :D

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Understanding the Classification of Diamonds
Understanding the diamond types makes you a better diamond expert
Editor's Note: The following is from our Journey Thru Gemology of 17 March, and is excerpted from the ISG Diamonds Course for the benefit of our ISG Global Community Members everywhere.
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When diamond crystals form deep inside the earth there are other elements present that can become a part of the diamond crystal. The two with the greatest impact are nitrogen (N) and boron (B).

Nitrogen (N) is the most common you will find, and is the main factor of off-color yellow diamonds as well as fancy yellow colored diamonds. This is because the nitrogen atoms will absorb certain wavelengths of light thereby causing the transmitted color of light leaving the diamond to be something other than white or colorless.

An example of the above is the Type 1a diamond, (sometimes written as Type Ia with Roman numeral I). In this diamond type the nitrogen absorbs the blue color of light. As a result, Type Ia diamonds will have a strong tendency to offer a slightly yellowish body color.

Let’s take a look at the four main types of diamonds. We are only going to take it down to these four basic types for our purposes here. You may hear of even smaller divisions of diamond types based on the number of nitrogen atoms in the crystal lattice. While this may have scientific importance, for our purposes of learning diamond quality grading the four divisions as listed below are the main divisions…and the one’s you will hear about most often in the market.

Type I Diamonds

Type I diamonds will have nitrogen present in the carbon crystal lattice. These diamonds compose the vast majority of diamonds on the market, and the variations of color will be directly impacted by the manner in which the nitrogen is present in Type I diamonds.
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Type Ia diamonds have nitrogen atoms that exist as clumps within the diamond’s carbon crystal lattice structure. Type Ia diamonds compose almost 98% of the diamonds found. The nitrogen atom groups have a tendency to absorb the blue light wavelength, thereby producing tinted yellow and brown color diamonds. At left you see a graphic showing how the nitrogen atoms form in clumps in the diamond crystal lattice. It should be noted that this is not a true rendition of the real diamond crystal lattice, but is presented here to help you remember the various types of diamonds and what goes into qualifying each within that group.
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Type Ib diamonds will still have nitrogen, but instead of residing as clumps of nitrogen atoms as Type Ia….Type Ib diamonds will have nitrogen atoms residing as single atoms interspersed throughout the diamond crystal lattice. This allows for a more uniform and complete presence of nitrogen in the diamond crystal, and for a remarkably different color impact on the diamond itself.

The impact of the single nitrogen atoms of Type Ib diamonds is that they now absorb more of the blue and green colors. Thereby causing a more intense and therefore deeper fancy yellow color. True natural Canary Yellow diamonds are most often of Type Ib, owing to the fact that the nitrogen absorbs a greater wavelength of colors from the yellow and blue spectrum, leaving a more pure yellow color, which is why most of your fancy yellow diamonds will indeed be Type Ib diamonds?

It should be noted that less than 1/10th of 1% of diamonds found are of Type Ib, which is one reason that fancy yellow colored diamonds are so rare and valuable.

Above is another graphic to demonstrate how the nitrogen atoms are interspersed within the carbon diamond crystal. And again…this is not out of a physics text book, it’s only so you can get a visual concept of the difference in a Type Ia and a Type Ib diamond in relation to the presence of nitrogen atoms in each.

Type II Diamonds

Type II diamonds will be virtually free from the presence of nitrogen. These diamonds are considered the purest of all diamonds owing to the fact that there are very few, if any, impurities in their crystal structure.
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Type IIa diamonds are the purest of all of the diamond types. These diamonds contain virtually no nitrogen…and most often none at all. These diamonds are generally completely colorless since only carbon is present in their crystal structure. It should be noted that most of your really big and famous diamonds such as the Koh-i-Noor diamond and others are of Type IIa. That is because these diamonds are of the purest formation and grow quite large, and they are the most transparent and colorless since they have no nitrogen in their crystal lattice structure.

At left is a graphic of the carbon structure to help you remember that the Type IIa diamonds are the purest crystal and usually produce a pure colorless crystal. Between 1 and 2 percent of diamonds on the market are of Type IIa diamonds.
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Type IIb diamonds are truly rare and unusual. With a Type IIb you have an impurity of boron (B) in the crystal structure. This has two important impacts on the diamond.

First, it causes the diamond to be electrically conductive, something no other diamond type will offer. In fact, the other classifications of diamond will be electrical insulators rather than conductors. So the presence of boron in the diamond crystal lattice will cause the diamond to be an electrical conductor.

Second, it causes the diamond to have a natural blue color, and sometime a blue grey color. This is how the famous blue Hope Diamond formed, as a result of the presence of boron in the diamond crystal. These natural blue diamonds are extremely rare and extremely expensive, owing to the fact that less than 1/10th of 1 percent of diamonds found are natural blue.

The key here is that the two factors serve a single and very important purpose: Natural blue diamonds are very expensive. However, there are radiated blue diamonds on the market that are artificially colored. These are fairly common in the current market and are valued far below a natural blue Type IIb diamond.

Owing to the fact that only natural blue diamonds are electrical conductors, it is fairly easy to identify a blue diamond as being natural or irradiated by testing for electrical conductivity.

This makes natural blue Type IIb diamonds both unique and valuable.


We welcome you to join us for the most fun and rewarding study of gemology and jewelry appraisal in the world....and at the most affordable price. Click the link below to visit the ISG Global Community and learn about our programs.
http://www.schoolofgemology.com


crazy8s wrote:Thanks Pink, I often wondered what was meant by a type 1a etc. diamond. Now I know, very cool :!: :D


Rockranger wrote:
crazy8s wrote:Thanks Pink, I often wondered what was meant by a type 1a etc. diamond. Now I know, very cool :!: :D
Ditto! :)


PinkDiamond wrote:I'm so glad it helped answer some questions for y'all. ;)
PinkDiamond
ISG Registered Gemologist


· ´¨¨)) -:¦:-¸.·´ .·´¨¨))
((¸¸.·´ ..·´ There are miracles left for you to do .... -:¦:- -:¦:-
-:¦:- ((¸¸.·´* It all begins inside of you. ;)
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