ニュース

Synthetic moissanite is much closer to diamond in overall appearance and heft than any previous diamond imitation; this article reports on how to identify and characterize it.
View the holiday schedule for all GIA locations worldwide.
Provides a visual guide to the internal features of natural, treated, synthetic, and imitation opal.
The history of Baja California has been closely tied to the exploitation of pearls since the 16th century.