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Synthetic ruby overgrowth on natural sapphire seed.
Two Unusual Natural Sapphires with Synthetic Ruby Overgrowth

For the first time, the Carlsbad and New York labs see natural sapphire seeds with synthetic ruby overgrowth.

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Photomicrographs of synthetic sapphire.
Multi-Elemental Diffused and Melt-Grown Synthetic Sapphire

GIA examines a multi-elemental diffused and melt-grown synthetic sapphire for the first time.

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Pink sapphire with glass filling.
Pink Sapphire Filled with Bismuth-Based Glass

A sapphire with a colour not commonly seen in the lab is found to have a glass filling.

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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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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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Two Strands of Treated Chalcedony
Winter 2009 G&G Lab Notes

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

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Spring 1994 G&G Lab Notes

This section, from the Spring 1994 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Spring 1987 G&G Lab Notes

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

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Summer 1992 G&G Lab Notes

This section, from the Summer 1992 issue of Gems & Gemmology, is a compilation of interesting finds from GIA's laboratories.

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Winter 1990 G&G Lab Notes

This section, from the Winter 1990 issue of Gems & Gemmology, is a compilation of interesting finds from GIA's laboratories.

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