A cape diamond examined in the New York lab shows rare yellow phosphorescence.
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Red fluorescence, rarely seen in natural colourless type IIa diamond, is observed at the New York lab.
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A natural type IIb diamond with rare colour and very strong 776.4 nm PL peak is seen at the Carlsbad lab.
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G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.
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A rare chameleon diamond is examined in GIA's Carlsbad lab.
Read MoreThis section, from the Summer 1992 issue of Gems & Gemmology, is a compilation of interesting finds from GIA's laboratories.
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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This section, from the Summer 2010 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
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This section, from the Summer 2009 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.
Read MoreThis section, from the Summer 2008 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.
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