Chatoyancy, rarely seen in play-of-colour opal, is observed in Ethiopian material.
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Boulder opal in sandstone matrix is seen as beads in Tucson.
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A summary of the content found in the Summer 2016 issue of Gems & Gemology.
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G&G Brief presents an overview of the content of the Winter 2015 issue of Gems & Gemology.
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An opal featuring a rare six-rayed star is examined in GIA's Bangkok lab.
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The natural-colour oolitic opal is the largest of its type examined by GIA.
Read MoreThis section, from the Summer 2012 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.
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A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewellery manufacturing techniques and industry trends.
Read MoreA compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewellery manufacturing techniques and industry trends.
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