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An iridescent cleavage in tanzanite
Iridescent Inclusion in Tanzanite

A tanzanite displayed crystallographically aligned, vividly iridescent colors resulting from fine separations along the stone’s cleavage planes.

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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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Article
GIA Gem Project
Various Gems (Taaffeite - Zoisite)

Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

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Blue freeform tanzanite in ring.
Exceptional Freeform Tanzanite and Oregon Sunstone Rings

A family sources, designs, and carves gems for extraordinary jewelry and pieces.

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Jaipur, India: The Global Gem and Jewelry Power of the Pink City

Examines Jaipur’s role as a colored stone cutting and jewelry manufacturing center, with profiles of 17 companies and their factory, trading, and retail operations.

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Pink sapphire mining pit at Kibuko, Tanzania
Update on Colored Gemstone Mining in Tanzania

Reports on an expedition to many known and new Tanzanian gem localities.

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Four “ginger” garnets
Ginger Garnet, “Fancy” Tanzanite

Garnets and a wide variety of tanzanite at the Tucson gem shows.

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Multicolored gem suite
High-End Colored Gems

A unique assortment of colored gemstones as seen at the GJX show in Tucson.

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15 ct tanzanite
Pleochroism in Faceted Gems: An Introduction

Describes the phenomenon of pleochroism and its complex effect on the appearance of colored stones.

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Merelaniite whisker inclusions in tanzanite.
Merelaniite Inclusions in Tanzanite

A recently identified mineral is found, in whisker-like form, in a gem-quality tanzanite host.

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