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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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Beads with submetallic luster.
Chalcedony Beads Coated With Titanium Nitride

Beads in an necklace show a metallic appearance not seen in chalcedony.

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The Identification of Blue Diffusion-Treated Sapphires

Blue diffusion-treated sapphires are becoming more prevalent than ever before.

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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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Gem Mountain mining site
Update on Rock Creek Sapphire Deposit

An overview of recently expanded sapphire production at the Gem Mountain mine near Philipsburg, Montana.

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Beryllium Diffusion of Ruby and Sapphire

The heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade.

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Article
An Introduction to Gem Treatments

A guide describing frequently encountered gem treatment processes, their detection, and special care tips for treated gems.

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Jaipur, India: The Global Gem and Jewelry Power of the Pink City

Examines Jaipur’s role as a colored stone cutting and jewelry manufacturing center, with profiles of 17 companies and their factory, trading, and retail operations.

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Turquoise bead with artificial metallic pyrite.
Turquoise with Simulated Matrix

A turquoise bead is found to have an artificial pyrite and resin matrix.

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Pieces of broken glass-filled ruby.
Durability of a Broken Glass-Filled Ruby

Heat treatment and glass filler are discovered in a ruby after it is broken during the jewelry setting process.

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