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Polished Freeform Topaz Imitating Diamond Rough

Akhil Sehgal and Riccardo Befi, November 23, 2015

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

Summer 1991 G&G Lab Notes

June 1, 1991

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

Summer 1987 G&G Lab Notes

June 1, 1987

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

Summer 1985 G&G Lab Notes

June 1, 1985

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