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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.

Inamori Synthetic Cat's-Eye Alexandrite

Robert E. Kane, September 1, 1987

This article reports on a detailed gemmological examination of this new synthetic cat's-eye alexandrite.

Decades-Old Synthetic Alexandrite Sheds Light on Modern-Day Research Needs

Jennifer Stone-Sundberg , October 18, 2013

An overview and commentary on the 2012 Journal of Gemmology article, “Flux-grown synthetic alexandrites from Creative Crystals Inc.”

“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”.

Composite Coral Veneer Glued to Artificial Matrix

Haibo Li, Zhoujing Yue, Jie Liang, Taijin Lu, Jun Zhang, and Jun Zhou , July 25, 2014

Items presented as red coral are revealed by testing to be composite coral veneers over an artificial matrix.

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.

Russian Flux-Grown Synthetic Alexandrite

Karl Schmetzer, Adolf Peretti, September 1, 1996

Synthetic alexandrite is being flux-grown in Russia.

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.