Banten opal (solid opal)

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Iskandarman
Posts: 78
Joined: Mon Jan 11, 2016 12:34 pm

Banten opal (solid opal)

Post by Iskandarman »

Just to show my largest 20.6 carats of crystal opal from Banten, Indonesia. Non-hydrophane but stable enough to withstand dry conditions without crazing.
Attachments
perspective view of 20.6 carats crystal opal
perspective view of 20.6 carats crystal opal
frontal view of 20.6 carats crystal opal
frontal view of 20.6 carats crystal opal
20.6 carats crystal opal
20.6 carats crystal opal
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PinkDiamond
Posts: 15411
Joined: Thu Jun 04, 2015 9:30 pm
Location: Ozark Mountains

Re: Banten opal (solid opal)

Post by PinkDiamond »

Wow, nice going on that one, and it's a great size! Do you wear them or gift them, or do you sell what you cut? That's a good one.

It's so good to see you pop in again and thanks for sharing that with us. I hope you've been doing great and all is well. :)
PinkDiamond
ISG Registered Gemologist


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Iskandarman
Posts: 78
Joined: Mon Jan 11, 2016 12:34 pm

Re: Banten opal (solid opal)

Post by Iskandarman »

at this moment i'll keep as my collection until i get enough number of this opal in my collection. On monday or tuesday i'll posting several large size Bantenese crystal glass clear tea colored base with nice blue-red-green POC, 3 pieces crystal opal (contraluz) from wood limb cast, 1 piece of phantom strong POC crystal glass clear and several more brown contraluz
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SwordfishMining
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Joined: Fri Jun 05, 2015 3:06 pm
Location: Denio, NV USA
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Re: Banten opal (solid opal)

Post by SwordfishMining »

We love opal that behaves dry. My collection kind of consists of the best of the best, knowing the best price is seldom offered for the best.
I'll jump over my shadow. https://www.virginvalleyopal.com"
Opals & more at my ESTY store https://swordfishmining.etsy.com"
Iskandarman
Posts: 78
Joined: Mon Jan 11, 2016 12:34 pm

Re: Banten opal (solid opal)

Post by Iskandarman »

One of my Banten contraluz crazed as soon as I dry it. This piece i'll keep in water until I get the right stabilization methods.
Attachments
Transparent contraluz banten
Transparent contraluz banten
Contraluz Banten opal
Contraluz Banten opal
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PinkDiamond
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Joined: Thu Jun 04, 2015 9:30 pm
Location: Ozark Mountains

Re: Banten opal (solid opal)

Post by PinkDiamond »

Wowser, what a bummer that such a beauty crazed! Do you ever use Opticon?
PinkDiamond
ISG Registered Gemologist


· ´¨¨)) -:¦:-¸.·´ .·´¨¨))
((¸¸.·´ ..·´ There are miracles left for you to do .... -:¦:- -:¦:-
-:¦:- ((¸¸.·´* It all begins inside of you. ;)
Iskandarman
Posts: 78
Joined: Mon Jan 11, 2016 12:34 pm

Re: Banten opal (solid opal)

Post by Iskandarman »

Never seen opticon yet at my location. Cynoacrylate glue probably the best for my sealer because both cynoacrylate and opal have same reflective index. I must figure out how to fill the glue deep inside the crazing line.
Iskandarman
Posts: 78
Joined: Mon Jan 11, 2016 12:34 pm

Re: Banten opal (solid opal)

Post by Iskandarman »

My best flawless and large Banten precious fire opal. 20.2 carats is extremely rare for Indonesian opal.
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20.2 carats of Banten fire opal
20.2 carats of Banten fire opal
Shea_O
Posts: 57
Joined: Sat Jan 27, 2018 9:02 pm

Re: Banten opal (solid opal)

Post by Shea_O »

Iskandarman wrote:Never seen opticon yet at my location. Cynoacrylate glue probably the best for my sealer because both cynoacrylate and opal have same reflective index. I must figure out how to fill the glue deep inside the crazing line.


I am extremely interested in your comment about cyano having the same refractive index as opal and using it as a “sealer” - so when you say “sealer” are you strictly referring to filling in cracks on damaged stones or do you mean a “seal” like a resin coating all the way around the stone?

I have been wondering if there are methods to use cyano as a “resin” aka apply it in some sort of flow coat method...I have Indonesian matrix opal that I would like to experiment with coating in cyano to protect the material and provide a surface that could be buffed/polished if scratched when worn as jewelry - to a glassy look just like crystal opal would look...... I wonder if cyano can polish to this effect? Please help
Iskandarman
Posts: 78
Joined: Mon Jan 11, 2016 12:34 pm

Re: Banten opal (solid opal)

Post by Iskandarman »

Just filling the crack for crystal opal...
For the matrix types, I coats them with cyno and repolished again until mirror-like finish
Attachments
Banten wood /matrix opal
Banten wood /matrix opal
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