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<em>Gota de Aceite</em> in an emerald from Zambia.
Gota de Aceite in a Zambian Emerald

A phenomenon usually seen in Colombian emeralds is found in a specimen from Zambia.

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Emerald with two drill holes
Unique Drilled Emerald

An emerald with drill holes containing a resinous material is seen in the New York lab.

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Different views show the color zoning in this emerald.
Colour-Zoned Emerald

An emerald with strong colour zoning along the pavilion facets demonstrates the importance of cutting and orientation in gem materials.

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Unusual Curved Colour Zoning In Emerald

A report on a 1.17 ct emerald obtained in Kabul, Afghanistan for GIA's permanent reference collection

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Summer 1994 G&G Lab Notes

This section, from the Summer 1994 issue of Gems & Gemmology, 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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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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Autumn 2008 G&G Lab Notes

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

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Winter 2007 G&G Lab Notes

This section, from the Winter 2007 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Arabic Writing in Emerald Crystals
Spring 2006 G&G Lab Notes

This section, from the Spring 2006 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

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