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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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Fancy Vivid yellow diamond
Very Large Irradiated Yellow Diamond

A very large diamond with a Fancy Vivid yellow color was identified as artificially irradiated.

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Orange-red-purple garnet and green clinopyroxene minerals can be analyzed for specific isotopes to help determine diamond ages.
Diamonds from the Deep: How Old Are Diamonds? Are They Forever?

Age dating diamonds, which have been forming for billions of years, using isotope analyses reveals new information about the deep earth.

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Titanium-coated tanzanite
Titanium-Coated Tanzanite

For the first time, GIA's laboratory has examined tanzanite color-coated with titanium.

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Imitation Rainbow Moonstone Assemblage

Examination of an imitation rainbow moonstone assemblage containing plastic-coated gypsum.

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Turquoise bead with artificial metallic pyrite.
Turquoise with Simulated Matrix

A turquoise bead is found to have an artificial pyrite and resin matrix.

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Recent production of turquoise from Polk County, Arkansas
Turquoise from Western Arkansas

A report on turquoise from the only known U.S. deposit outside of the Southwest.

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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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Sapphires from Australia

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

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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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