Guardians of Trust: GIA’s Innovative Research, Instruments and Services
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
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
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
Overview and commentary on the 2014 Journal of Gemmology article “Purple to Reddish Purple Chrysoberyl from Brazil”.
Composite Coral Veneer Glued to Artificial Matrix
Items presented as red coral are revealed by testing to be composite coral veneers over an artificial matrix.
Spring 1991 G&G Lab Notes
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
Synthetic alexandrite is being flux-grown in Russia.
The Distinction of Natural from Synthetic Alexandrite by Infrared Spectroscopy
A useful way to identify stones that contain no distinguishing inclusions.