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Irradiated 1.06 ct brownish orange HPHT synthetic diamond
Photoluminescence Mapping of Optical Defects in HPHT Synthetic Diamond

Demonstrates the importance of this method in identifying diamond treatments, based on the analysis of PL maps acquired from a brownish orange HPHT synthetic diamond.

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On the left is a 5.26 ct Fancy deep blue heart shape HPHT synthetic diamond. On the right is a 5.27 ct Fancy deep blue emerald cut HPHT synthetic diamonds.
Article
The Latest on Synthetic Diamonds

Dr. James Shigley, GIA distinguished research fellow, is one of the foremost experts in diamonds and their identification. In this presentation recorded at the 2017 JCK Las Vegas show, he shares the latest developments about HPHT and CVD synthetic diamond

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

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

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

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

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Article
Identifying Lab-Grown Diamonds

Dr. James E. Shigley describes the means of distinguishing colorless and colored synthetic gem-quality diamonds from natural diamonds.

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Summer 2016 Gems & Gemology Cover
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Summer 2016 G&G: Diamonds from Diavik, Responsible Sourcing, and Fabergé Cossack Figures

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

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Gems & Gemology Spring 2016 Cover
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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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5.03 ct Fancy Deep Blue HPHT Synthetic Diamond
Largest Blue HPHT Synthetic Diamond

Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.

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Six HPHT yellow melee diamonds
Analysis of Yellow Diamond Melee for Color Treatment and Synthetics

A parcel revealed to contain natural, treated, and synthetic diamonds reinforces the importance of identification.

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Green-blue CVD synthetic diamonds.
Irradiated Green-Blue CVD Synthetic Diamonds

Advancing CVD growth technologies yield intensely colored, high-quality synthetic diamonds, such as the two green-blue synthetic materials seen in the New York lab.

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