Research & News
Pink Mozambique Sapphire
Examination and testing of a beautiful large pink sapphire establishes its lack of treatment and its origin in Mozambique.
GIA Knowledge Sessions
Engage in webinars on the most diverse and pressing issues in gemology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemology.
Occurrence of Petrified Woods in the Russian Far East: Gemology and Origin
Scientists in Russia construct an origin story through the analysis of petrified wood popularly used in the souvenir trade.
Trapiche-Like Pattern in an Emerald from Pakistan
Brightfield illumination reveals a distinctive growth pattern similar to trapiche in a beautiful emerald from Swat Valley.
Quench-Crackled Dyed Blue Chalcedony Resembling Larimar
Raman spectroscopy confirms sea-blue beads with a similar appearance to Larimar are actually quench-crackled chalcedony.
Greenish Blue Glass Imitating Gem Silica
Gift shop specimens sold as gem silica prove to be good imitations in colored glass.