The Carlsbad and New York laboratories and schools will be closed on Monday, May 28 in observance of the Memorial Day holiday. These locations will resume regular business hours on Tuesday, May 29.
Research & News
New Plastic Imitation Opal from Kyocera
A plastic product that mimics the play-of-color phenomenon of natural opal but has distinctly different gemological properties is now available to consumers.
Advanced Synthetic Diamond Seminar in Hong Kong, June 19
Learn the latest techniques to identify synthetic diamonds from GIA researchers. Seating is Limited.
2018 GIA Symposium
Scientists and business leaders will gather at a summit of the gem and jewelry industry.
Aquamarine from Pakistan
A gemological investigation of the aquamarine that has emerged from northern Pakistan in recent years.
Green Crystals in Yellow Sapphires
Two yellow sapphires yield surprising green inclusions.
Making of M.D. Hohenstine’s Gem Displays
Jeweler M.D. Hohenstine’s spectacular window displays were a beloved tradition in downtown Columbus, Ohio, for more than 50 years.
Type IIa Diamond with Extraordinary Etch Channels
Rare dissolution etch channels are seen in a natural diamond.