Large CVD-Grown Diamond Resubmitted after HPHT Treatment
A record holder for largest CVD-grown diamond is examined for a second time in the Carlsbad laboratory after HPHT treatment.
Pink and Red Epidote in Quartz
“Firework” sprays of hot pink to red epidote crystals are discovered in two rock crystal quartz cabochons.
Trigon Party on a Diamond
A cluster of trigons is observed on the surface of a 1.01 ct natural diamond.
Electroformed Gold Bracelet
Examination of gold bracelet bearing a 14K hallmark reveals a wax or resin material under gold plating.
Gemstones and Art
A visit to the Tucson Fine Mineral Gallery uncovers impressive gemstone-related artwork.
An Exceptional Cat’s-Eye Emerald
A double cabochon cat’s-eye emerald conjures fond memories for an estate dealer in Tucson.
Mineralogy and Geochemistry of Turquoise from Tianhu East, Xinjiang, China
Examines turquoise from northern China and identifies a geographic origin indicator to distinguish it from other Chinese sources.
“Ice Jade” from Guatemala
Characterizes a translucent variety of jadeite jade from the Morales mine in Guatemala.
Nanoscale Techniques for Characterizing Gemstone Coatings: A Case Study on Synthetic Moissanite
Provides a basis for analyzing colored coatings on a variety of polished gemstones.
Beyond Beauty: A Garnet Necklace Decoded
A platinum necklace featuring 28 rare garnets won two 2023 AGTA Spectrum Awards.
The Lengthy Vertical Journey of Superdeep Diamonds
Explores the journey of superdeep diamonds to the earth’s surface.
Seventh Annual Gianmaria Buccellati Foundation Award Winner
A graduate of GIA’s Jewelry Design program in Taiwan is the recipient of the 2023 Gianmaria Buccellati Foundation Award.
CVD with “Ancient Text” Clouds
A CVD-grown diamond exhibits an interesting clarity characteristic.
G&G Features in a Flash: Texas Topaz
Learn about Texas topaz history and geographic origin research.
New and Notable Finds from the GIA Lab: Winter 2023
Discover a bicolor chameleon diamond, a diamond with carbon dioxide, and a pink square inside a diamond.
Gems of Northern Madagascar Video with GIA Field Gemology
Learn all about the gems of Northern Madagascar in this exciting video with Wim Vertriest, GIA Manager of Field Gemology.
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