A summary of the content found in the Summer 2016 issue of Gems & Gemology.
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An opal rough is immersed in water and treated with oil and Opticon to observe effects on transparency and play-of-colour.
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An investigation of a coated fire opal recently found in the Chinese market.
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The first documented UV-reactive chemical treatment to make opal appear tenebrescent.
Read MoreA simple test easily detected dye treatment in fire opal.
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Matrix opal from Andamooka, in South Australia, is a precious opal-included porous rock that is commonly colour enhanced (carbon impregnated) to imitate the highly prized black opal from Lightning Ridge in northern New South Wales, Australia.
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This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
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