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

Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley

February 1, 2019

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

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Sapphires from Australia

Terrence Coldham

September 1, 1985

An overview of Australia's recent significance in the production of blue sapphire.

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Parisite inclusion in emerald.
Chart: Inclusions in Natural, Synthetic, and Treated Emerald

Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley

January 27, 2017

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

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

Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley

January 26, 2018

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

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Newly recognized mineral crowningshieldite in a diamond sample
Crowningshieldite: A New Mineral

February 1, 2019

A newly discovered mineral, crowningshieldite, was accepted on September 18, 2018, by the International Mineralogical Association.

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Suggested Reading on Diamond Inclusions

February 1, 2019

Suggested Reading on Diamond Inclusions

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Sapphires from Bingham Canyon (Utah) and Yogo Gulch
Gem Localities and Formation

December 4, 2018

Poster abstracts on “Gem Localities and Formation” from GIA’s 2018 International Gemological Symposium.

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Mozambican ruby with signs of heat Treatment
Colored Stones and Pearls

December 4, 2018

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

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FTIR spectrum and DiamondView images of type Ib-IaA diamond
Diamond Geology

December 4, 2018

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

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

December 4, 2018

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

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