Research & News
Resin Imitation Ivory with “Engine-Turned” Structure
Resin imitation ivory can display striations similar to those in elephant and mammoth ivory.
Latest Laboratory Promotions
View details about the latest diamond grading promotions.
Diamond Market Recovery, Auction Results
World’s two largest diamond producers say market is stabilizing after several months of severe cutbacks in rough sales. Christie’s and Sotheby’s sales.
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.
Dyed Serpentine Imitating Sugilite
Advanced testing confirms dyed material as serpentine, rather than the sugilite it was meant to imitate.
New Find of Deep Blue Nigerian Aquamarine
Nigerian aquamarine with exceptionally deep and saturated color also displays unusually strong pleochroism.