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1.15 ct round brilliant diamond
Chart: Inclusions in Natural, Synthetic, and Treated Diamond

Provides a visual guide to the internal features of natural, synthetic, and treated diamonds.

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Micro-Features of Ruby
Chart: Inclusions in Natural, Synthetic, and Treated Ruby

Provides a visual guide to the internal features of natural, synthetic, and treated rubies.

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Diamond from Jericho eclogite and Juina superdeep diamond
Diamonds from the Deep: How Do Diamonds Form in the Deep Earth?

G&G’s newest section explores how diamonds form in the deep earth.

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Gold veins in natural gold-in-quartz
Manufactured Gold-in-Quartz Jewelry

Manufactured gold-in-quartz jewelry was examined in the Carlsbad lab.

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Suggested Reading on Diamond Inclusions

Suggested Reading on Diamond Inclusions

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Pinctada maculata pearls and mollusk shell
The Gemological Characteristics of Pipi Pearls Reportedly from Pinctada maculata

Reveals the internal features and spectroscopic data of these small natural pearls and offers the means of separating them from pearls of related mollusk species.

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Mozambican ruby with signs of heat Treatment
Colored Stones and Pearls

Poster abstracts on “Colored Stones and Pearls” from GIA’s 2018 International Gemological Symposium.

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Color distribution in nitrogen-doped CVD after irradiation and annealing
Diamond Identification

Poster abstracts on “Diamond Identification” from GIA’s 2018 International Gemological Symposium.

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Nephrite from Luodian, China
Gem Characterization

Poster abstracts on “Gem Characterization” from GIA’s 2018 International Gemological Symposium.

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Victorian Whitby jet
General Gemology and Jewelry

Poster abstracts on “General Gemology and Jewelry” from GIA’s 2018 International Gemological Symposium.

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