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Paraíba Tourmaline with Unusual Coating

Kazuko Saruwatari and Philip G. York, May 8, 2017

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

Summer 2009 G&G Lab Notes

June 1, 2009

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

Summer 2005 G&G Lab Notes

June 1, 2005

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

Summer 1982 G&G Lab Notes

June 1, 1982

This section, from the Summer 1982 issue of Gems & Gemmology, is a compilation of interesting finds from GIA's laboratories.