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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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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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HPHT-processed yellow rough diamond.
Yellow HPHT-Processed Rough Diamond

HPHT annealing of a nearly eye-clean yellow natural rough diamond is revealed through spectroscopic analysis.

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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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LPHT-annealed CVD synthetics with their DiamondView images
LPHT-Annealed Pink CVD Synthetic Diamonds

The New York lab examines three pink CVD synthetic diamonds which have received LPHT annealing treatment.

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Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry Design and the Latest in Synthetics

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

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Fancy Vivid yellow diamond
Very Large Irradiated Yellow Diamond

A very large diamond with a Fancy Vivid yellow color was identified as artificially irradiated.

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