Research & News
Snowflake Inclusions in Mong Hsu Ruby
A holiday snowflake scene in a treated Mong Hsu ruby surprises and delights a gemologist in the Bangkok lab.
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.
Unusual Absorption in a Blue Flux-Grown Synthetic Sapphire
The Bangkok lab identified unexpected characteristics in a flux-grown synthetic sapphire.
Unmasking Emerald Filler
A long-wave ultraviolet flashlight illuminates chalky blue fluorescence in a fracture-filled emerald.
Rare Intense Purplish Pink Montana Sapphire
A Montana sapphire of unusual size and color proves to be from the secondary deposit of Rock Creek.
Update on Inclusions in Emeralds from Davdar, China
Testing reveals interesting inclusions in Chinese emeralds to be calcite and dolomite.