Three Large Natural Hollow Pinctada radiata Pearls
Quartz Assemblage Imitating Emerald
CVD-Grown Diamond with Unusual Cause of Greenish Color
Unique Trapiche Grossular from China
Grossular crystals cut along specific orientations reveal a distinct trapiche structure.
New Väyrynenite Production from Nigeria
Exceptional Nacre Thickness of Hybrid Akoya Bead Cultured Pearls
Diamond Trader Ishaia Gol
Iridescent Gems Cut from Hinge Ligament of South Sea Pearl Oyster (Pinctada maxima)
GIA 7 Pearl Value Factors: An Update on Nacre Classification
Pezzottaite with Multiple Cat’s-Eyes
Emeralds and Beryl from Kazakhstan and Ukraine
HPHT-Processed Natural and Laboratory-Grown Diamonds with Counterfeit Inscriptions
The Science of Phenomenal Gems, a Summary of Pegmatites, and a Cutter’s Remarkable Journey
Imitation Seed Pearl with Blue X-Ray Fluorescence
Gem Granitic Pegmatites
Describes the geology, mineralogy, and formation of granitic-composition pegmatites and provides a summary of their worldwide occurrences.
Structures Behind the Spectacle: A Review of Optical Effects in Phenomenal Gemstones and Their Underlying Nanotextures
Provides a comprehensive summary of the special optical effects in gemstones, including opalescence, chatoyancy, asterism, schiller, and iridescence, and investigates the submicron inclusions and nanotextures in each type of phenomenal stone.
How-To Guide: Testing Diamonds and Gems using UV Light
GIA developed this guide so retailers can use fluorescence tests to help identify gems right in their own stores.
“Enhydro” Amethyst from Morocco
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