Research & News
The GIA Diamond Origin Report: Traceability Based on Science
Consumers now, more than ever, have a heightened awareness of sustainably and ethically sourced products. The GIA Diamond Origin Report uses scientific evaluation to provide confirmation of a diamond’s geographic origin.
Latest Laboratory Promotions
View details about the latest diamond grading promotions.
Dyed Serpentine Imitating Sugilite
Advanced testing confirms dyed material as serpentine, rather than the sugilite it was meant to imitate.
Holiday Sales Predictions, Sotheby’s Sales
U.S. holiday sales predictions are better than expected. Sotheby’s Hong Kong auction features a 100 ct yellow diamond necklace by GIA alumna Anna Hu.
Intergrown Emerald Specimen from Chivor
An emerald specimen from Chivor hosts a large, well-formed emerald inclusion.
Imitation Opal with Interesting Play-of-Color Pattern
New imitation opal displays pronounced play-of-color phenomenon in a unique pattern covering large surface areas.