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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.
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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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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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Faceted blue zircons
Reversible Color Modification of Blue Zircon by Long-Wave Ultraviolet Radiation

Determines whether blue zircon, inadvertently altered to brown by exposure to long-wave UV radiation, can be restored to its original color through the use of incandescent light.

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Eight natural-color pistachio pearls
Identification of “Pistachio” Colored Pearls Treated by Ballerina Pearl Co.

A report on the color treatment process for these intensely greenish yellow to yellowish green cultured pearls and the techniques for identifying them.

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Four types of heated Baltic amber
Experimental Studies on the Heat Treatment of Baltic Amber

Amber samples were heat-treated, using various procedures and parameters, in an effort to reproduce materials found in the jewelry market.

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