Research & News
Spring Into Color
Register for four days of continuing education seminars, a virtual alumni event and a Knowledge Rocks session.
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.
Marble Imitation of Jadeite Rough
A stone submitted as rough jadeite proves upon analysis to be marble, indicative of the increasing use of imitations in the jewelry market.
Quarterly Crystal: Pyrite in Quartz
Bright and brassy crystalline pyrite inclusions add interest to a fine specimen of Colombian rock crystal quartz.
Exceptional Purple Montana Sapphire
A particularly fine unheated purple Montana sapphire is noted for both its size and its multiple diverse inclusions.