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Cobalt-Doped Composite Sapphires: A Blessing or a Curse?

Overview and commentary on the Spring 2013 InColor article, “Cobalt-Colored Composite Sapphires.”

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Abstracts; Winter 1991

This article, from the Winter 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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Abstracts; Fall 1991

This article, from the Fall 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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Abstracts; Spring 2009

This article, from the Spring 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Fall 2009

This article, from the Fall 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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Abstract Header from the 2009 issue of Gems & Gemology
Abstracts; Winter 2009

This article, from the Winter 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

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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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Milky white opals
UV-Reactive Opal

The first documented UV-reactive chemical treatment to make opal appear tenebrescent.

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Glass-filled yellow sapphire
Yellow Sapphire Filled with Lead Glass

Lead-glass-filled orangy yellow sapphire undergoes laboratory observation.

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Scapolite fragments exposed to UV radiation
Tenebrescent Irradiated Scapolite

The effect of irradiation on scapolite with tenebrescence, a color-change phenomenon that occurs after exposure to UV light.

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