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Research & News
This Month's
The Latest in Field Gemology from Wim Vertriest
Learn the latest on Madagascar sapphires and demantoid garnets from Wim Vertriest, GIA Manager of Field Gemology.
Laboratory-Grown Diamonds: An Update on Identification and Products Evaluated at GIA
Reviews the advancements and major trends in laboratory-grown diamonds observed by GIA since 2007.
A Large Multicolored Natural Blister Pearl
A large baroque-shaped blister pearl with a unique multicolored appearance is examined in the Mumbai laboratory.
Fireworks in Ruby
An unheated purplish red ruby cabochon displays a white twelve-rayed double-star phenomenon.
Laboratory Growth of Gem Materials and the Attempt to Replicate Nature
Provides an overview of processes for synthesizing gem materials and explains how unique growth conditions enable them to be separated from naturally formed gems.
New Emerald Production from the Curlew Mine, Western Australia
GIA’s Bangkok laboratory studies emeralds from the Curlew mine’s recently renewed production.
Dance of Light and Color: Painted Labradorite
Artist Valentina Fetisova transforms labradorite cabochons into remarkable works of art.
Micro-Features of Tourmaline
Provides a visual guide to the internal features of tourmaline as well as tourmaline inclusions in other gem hosts.