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A large group of people outside on GIA’s Carlsbad, California  campus.
Article
Guardians of Trust: GIA’s Innovative Research, Instruments and Services

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.

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Largest blue HPHT synthetics
Article
Large Blue and Colourless HPHT Synthetic Diamonds

Five large HPHT synthetic diamonds, examined at GIA’s Hong Kong lab, indicate the advances that HPHT growth technology has made in quality and size.

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Article
Autumn 2015 G&G: Trapiche Emeralds, Synthetic Diamonds and a Large Diamond Source

G&G Brief presents an overview of the content of the Autumn 2015 issue of Gems & Gemology.

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Fall 2016 Gems & Gemology Cover
Article
Autumn 2016 G&G: CVD Synthetic Diamonds Survey, Reversible Colour Change in Blue Zircon

A summary of the content found in the Autumn 2016 issue of Gems & Gemology.

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Gems & Gemology Spring 2016 Cover
Article
Photoluminescence Review and Gem Material from Unusual Locales in the Spring 2016 G&G

A summary of the content in the Spring 2016 issue of Gems & Gemology.

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Article
Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

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shell pearl necklace, bracelet, earrings
Shell Pearl as a Pearl Imitation

Examination of commercially-available "shell pearls" reveals imitation material.

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The Art of Bulgari: La Dolce Vita and Beyond
Books: The Art of Bulgari: La Dolce Vita and Beyond, 1950–1990

Review of Martin Chapman and Amanda Triossi’s The Art of Bulgari: La Dolce Vita and Beyond, 1950–1990.

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Fancy black NPD synthetic diamond
Fancy Black NPD Synthetic Diamond

Testing reveals the first synthetic nano-polycrystalline diamond (NPD) to be detected by a gem lab.

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Jewels of the Romanovs: Family & Court, second edition
Books: Jewels of the Romanovs: Family & Court

Review of Stefano Papi’s Jewels of the Romanovs: Family & Court.

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