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.
Record-Size Natural Moissanite Crystals Discovered in Israel
Natural moissanite crystals found in Israel has broken world records, with evidence of larger crystals in the area.
Russian Flux-Grown Synthetic Alexandrite
Synthetic alexandrite is being flux-grown in Russia.
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.
Gemstones with Alexandrite Effect
The term "alexandrite effect" refers to the apparent change of colour in certain minerals from blue-green or greenish violet in daylight to red or reddish violet in incandescent light.
Alexandrite History and Lore
The gem was named after the young Alexander II, heir apparent to the throne. It caught the country’s attention because its red and green colours mirrored the Imperial Russian flag.