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Orange Opals and sugar!
https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=24&t=17834
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Author:  GemsForSale [ Mon Mar 11, 2013 5:00 pm ]
Post subject:  Orange Opals and sugar!

I never heard about this treatment explained in this article:

blog.thejewellerychannel.tv/sweet-orange-opal/

(I found that link shared on googleplus)

Do you know something about it and how to spot some treated opals, maybe sold for fire opals?
Thanks

Author:  Isi [ Mon Mar 11, 2013 5:55 pm ]
Post subject:  Re: Orange Opals and sugar!

I have heard of such a treatment to obtain black opal (by carbonisation of the sugar).
Maybe this is a matter of gradation of the carbonisation ? You get orange before getting black ? Like caramel ?

Author:  rednox [ Thu Mar 21, 2013 12:35 pm ]
Post subject:  Re: Orange Opals and sugar!

I have an orange opal which was said treated by Smoke & Sugar Acid. I heard this treatment should creating black color instead of orange. Please correct me if i'm wrong. To be honest I'm not quite sure about the lab result which make a statement that is a treated by smoke & sugar acid. Please check pictures below, please help me to confirm.

Image

Image

Thanks

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