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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
Pyrope Garnet and Montana Sapphires Highlight Winter 2015 G&G

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

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Eight HPHT faceted synthetic diamonds from AOTC Group
Near-Colorless HPHT Synthetic Diamonds from AOTC Group

Presents the gemological and spectroscopic properties of a suite of synthetic diamonds grown by AOTC using high pressure and high temperature.

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Man Sin mining
Hunting for
“Jedi” Spinels in Mogok

Documents a series of visits to Myanmar in search of exceptionally bright pinkish red spinels possessing no dark tones.

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Update on Ammolite Production from Southern Alberta, Canada

There have been a number of changes in Ammolite production from southern Alberta, Canada, since 2001.

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Green Amber
Characterization of “Green Amber” With Infrared and Nuclear Magnetic Resonance Spectroscopy

A peridot-like bright greenish yellow to green gem material called “green amber” has recently appeared in the gem market.

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Liddicoatite Tourmaline from Anjanabonoina, Madagascar

Liddicoatite, a calcium-rich lithium tourmaline, was recognized as a separate mineral species in 1977, and named in honor of Richard T. Liddicoat.

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Tucson: A Showcase of Colored Gemstone Innovation

An overview of the Spring 2016 Gems & Gemology content.

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Garnets, Sapphires, Opals, and Tarnish on High-Purity Gold

An overview of the Winter 2015 Gems & Gemology content.

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High-purity gold items
Characterization of Tarnish Spots in Chinese High-Purity Gold Jewelry

Examines the origin and nature of tarnish spots in high-purity gold and how they can be avoided.

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