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Diamond with uneven “lizard skin” surface texture.
Lizard Skin on Deformed Diamond

The surface texture of a diamond is affected by the gemstone’s structure.

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The 187.63 ct Foxfire rough diamond.
The Foxfire Diamond, Revisited

The 187.63 ct rough diamond from Canada’s Diavik mine shows surprising reactions to ultraviolet light.

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Article
Melee: Building Blocks of Contemporary Design

Learn about the versatility of melee in jewelry design and how to design and engineer long-lasting jewelry using GIA Quality Assurance Benchmarks.

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Synthetic diamond with fake GIA inscription.
Synthetic Diamond Fraudulently Inscribed To Match Natural Diamond Report

A specimen seen in the Carlsbad lab for an updated diamond grading report does not match the previous documentation.

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A pair of pearl and diamond earrings set with one CVD synthetic melee.
A Melee-Sized CVD Synthetic Diamond in Pearl and Diamond Jewelry

A CVD-grown melee is found in a pearl and diamond earring.

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Article
The Unexpected Origins of Big Diamonds

Dr. Evan Smith, Ph.D., GIA research scientist, has dedicated his work to methodically characterizing the inclusions found in rare diamonds. In this video presentation recorded at the 2017 JCK Las Vegas show, Smith shares his findings on the unexpected ori

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The kyanite inclusion identifies the diamond as having an eclogitic origin.
Kyanite: A Rare Blue Guest in Diamond

An unexpected crystal within a diamond helps to identify the gemstone’s geologic origin.

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Fluorescence reaction of diamond.
Diamond with Unusual Fluorescence Distribution

A submission to the New York lab yields an unexpected reaction to long-wave UV radiation.

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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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Yellow-green cape diamond.
Cape Diamond with Yellow Phosphorescence

A cape diamond examined in the New York lab shows rare yellow phosphorescence.

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