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GIA Website Privacy Notice

GIA Website Privacy Notice

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A Selection of Faceted Natural Ametrines.
Using Conventional Equipment to Separate Natural from Synthetic Ametrine

A summary of the article “A simple approach to separate natural from synthetic ametrine,” by Francine Payette.

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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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Titanium-Bearing Synthetic Alexandrite and Chrysoberyl

Overview and commentary on the 2013 Journal of Gemmology article “Titanium-Bearing Synthetic Alexandrite and Chrysoberyl.”

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Student Privacy Notice

Student Privacy Notice

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A blue diamond with inclusions under the table is held up in tweezers.
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Where Do Blue Diamonds Come From? Blue Diamonds Have a Surprising “Superdeep” Origin and a Link to Ancient Oceans

This is an extended abstract of the article ‘Blue boron-bearing diamonds from Earth’s lower mantle,’ published in the 2018 August issue of Nature. GIA Researcher Evan Smith is the lead author of the article.

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Letters: Note on CVD Synthetic Overgrowth

A response to the Summer 2017 Lab Note on CVD synthetic overgrowth on a natural diamond.

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Letters: Trapiche Nomenclature

A response to the Fall 2015 G&G article on trapiche emerald from Colombia.

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Letters: Analysis of Three-Phase Inclusions in Emerald

A response to the Summer 2014 G&G article on three-phase inclusions in emerald.

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Decades-Old Synthetic Alexandrite Sheds Light on Modern-Day Research Needs

An overview and commentary on the 2012 Journal of Gemmology article, “Flux-grown synthetic alexandrites from Creative Crystals Inc.”

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