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Article
The Magic of Colored Diamonds

Colored diamonds are in the spotlight. They’re routinely breaking records at auction houses. Learn more about these gemological marvels of the rarest order.

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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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Hydrogen-rich Diamonds
Gray-To-Blue-To-Violet Hydrogen-Rich Diamonds from the Argyle Mine, Australia

The Argyle diamond mine is the only known source of type IaB hydrogen- and nitrogen-rich diamonds colored gray to blue to violet.

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0.45 ct Pink CVD Labgrown Diamond
Strongly Colored Pink CVD Lab-Grown Diamonds

Pink CVD lab-grown products can be separated from natural and treated-color natural pink diamonds by a combination of gemological and spectroscopic properties, which are explored in this study.

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2.51 and 3.23 ct CVD synthetic diamonds
Two Large CVD-Grown Synthetic Diamonds Tested by GIA

Two near-colorless rounds, weighing 3.23 and 2.51 ct, were the largest CVD-grown synthetic diamonds GIA has examined.

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1.50 ct Fancy Dark gray CVD synthetic diamond
Two Fancy Dark Gray CVD Synthetic Diamonds

Examination of two CVD synthetic diamonds with an unusual Fancy Dark gray color.

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Irradiated CVD Synthetic Diamond
Heavily Irradiated CVD Synthetic Diamond

A look at the first CVD synthetic diamond examined at GIA that has been irradiated to a blue color.

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Article
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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CVD synthetic diamond
CVD Synthetic Diamond with Fancy Vivid Orange Color

Strong absorptions from N-V centers were the main cause of a CVD synthetic diamond’s pinkish orange bodycolor.

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A Large Irradiated Green-Yellow Diamond

GIA's identification of a large diamond as artificially irradiated based on careful spectroscopic analysis and lab database review.

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