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Guardians of Trust: GIA’s Innovative Research, Instruments and Services

Russell Shor, September 20, 2019

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.

“Red” Chrysoberyl versus Alexandrite: The Impact of Elevated Chromium Levels on Colour and Colour-Change Properties

Jennifer Stone-Sundberg , October 31, 2014

Overview and commentary on the 2014 Journal of Gemmology article “Purple to Reddish Purple Chrysoberyl from Brazil”.

Spring 1991 G&G Lab Notes

March 1, 1991

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

The Distinction of Natural from Synthetic Alexandrite by Infrared Spectroscopy

Carol M. Stockton and Robert E. Kane, March 1, 1988

A useful way to identify stones that contain no distinguishing inclusions.