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Freeform topaz under daylight-equivalent light.
Polished Freeform Topaz Imitating Diamond Rough

Material submitted as a rough diamond is revealed through gemmological testing and analysis to be a near-colourless topaz.

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Summer 1987 G&G Lab Notes

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

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Winter 1995 G&G Lab Notes

This section, from the Winter 1995 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Spring 1998 G&G Lab Notes

This section, from the Spring 1998 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Metmict Zircon
Summer 1991 G&G Lab Notes

This section, from the Summer 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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Pumpellyite in Quartz
Autumn 2009 G&G Lab Notes

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

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Autumn 1997 G&G Lab Notes

This section, from the Autumn 1997 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.

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Summer 1985 G&G Lab Notes

This section, from the Summer 1985 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

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