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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.

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.

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

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.

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.

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

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.

My best flawless and large Banten precious fire opal. 20.2 carats is extremely rare for Indonesian opal.

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

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