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Diamond with uneven “lizard skin” surface texture.
Lizard Skin on Deformed Diamond

The surface texture of a diamond is affected by the gemstone’s structure.

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Yellow-green cape diamond.
Cape Diamond with Yellow Phosphorescence

A cape diamond examined in the New York lab shows rare yellow phosphorescence.

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Round brilliant diamond showing bright red fluorescence.
Natural Colourless Type IIa Diamond With Bright Red Fluorescence

Red fluorescence, rarely seen in natural colourless type IIa diamond, is observed at the New York lab.

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Fancy gray-purple type IIb diamond seen in the Carlsbad lab
Rare Type IIb Grey-Purple Diamond

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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Winter 2011 G&G Lab Notes

This section, from the Winter 2011 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Fall 2011 G&G Lab Notes

This section, from the Fall 2011 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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1.79 ct Diamond in DiamondView
Summer 2009 G&G Lab Notes

This section, from the Summer 2009 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Spring 2015 G&G Examines Blue Spinel, Chinese Jewellery Design and the Latest in Synthetics

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

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Winter 2012 G&G lab notes

This section, from the Winter 2012 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

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Spring 2012 G&G Lab Notes

This section, from the Spring 2012 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

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