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HOC synthetic alexandrite inclusion.
Challenges in Orienting Alexandrite: The Usambara and Other Optical Effects in Synthetic HOC-Grown Russian Alexandrite

Overview and commentary on the 2013 Journal of Gemmology article “Synthetic alexandrites grown by the HOC method in Russia: Internal features related to the growth technique and colorimetric investigation.”

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Natural diamond with CVD synthetic diamond overgrowth
CVD Layer Grown on Natural Diamond

A composite of synthetically grown and natural diamond was recently identified by the Carlsbad laboratory.

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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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Article
Identifying Lab-Grown Diamonds

Dr. James E. Shigley describes the means of distinguishing colorless and colored synthetic gem-quality diamonds from natural 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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Ring set with 194 natural diamonds and one HPHT-grown specimen
Single HPHT Synthetic Diamond Mixed in Natural Diamond Ring

Single HPHT laboratory-grown diamond identified in a ring containing 194 natural diamonds.

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One irradiated CVD synthetic diamond found in a group of 300 irradiated natural melee diamonds
An Irradiated CVD Synthetic Melee Diamond Found in Irradiated Natural Melee Diamonds

Single irradiated CVD synthetic was identified in a parcel of irradiated natural melee diamonds in the Tokyo lab.

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Suggested Reading on Diamond Inclusions

Suggested Reading on Diamond Inclusions

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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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