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Paraíba tourmaline with coating.
Paraíba Tourmaline with Unusual Coating

A coated Paraíba tourmaline is seen for the first time at a GIA lab.

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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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Winter 1989 G&G Lab Notes

This section, from the Winter 1989 issue of Gems & Gemmology, is a compilation of interesting finds from GIA's laboratories.

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Autumn 1987 G&G Lab Notes

This section, from the Autumn 1987 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

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Autumn 2000 G&G Lab Notes

This section, from the Autumn 2000 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

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Autumn 1986 G&G Lab Notes

This section, from the Autumn 1986 issue of Gems & Gemology, is a compilation of interesting finds from GIA's laboratories.

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Spring 2010 G&G lab notes

This section, from the Spring 2010 issue of Gems & Gemology, is a compilation of interesting finds from GIA's laboratories.

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DiamondView Images of Rubies
Autumn 2004 G&G Lab Notes

This section, from the Autumn 2004 issue of Gems & Gemology, is a compilation of interesting finds from GIA's laboratories.

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Winter 2008 G&G Lab Notes

This section, from the Winter 2008 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Summer 2005 G&G Lab Notes

This section, from the Summer 2005 issue of Gems & Gemmology, is a compilation of interesting finds from GIA's laboratories.

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