What Is Tourmaline Gemstone | Tourmaline Stone – GIA

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Tourmaline

Tourmalines have a variety of exciting colors with one of the widest color ranges of any gem.

Tourmaline

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SU15-GNI-fig48_185331-636x358.jpg. A unique parti-color Brazilian tourmaline necklace.

SP17-Katsurada-Fig2_212255-636x297.jpg. Tourmaline group classification of cuprian liddicoatite samples

SP17-Katsurada-Fig3_212261-900x575.jpg. Pb vs. Ga concentration of cuprian liddicoatite samples

SP17-Katsurada-Figure-1_212256-636x358.jpg. Six cuprian liddicoatite tourmalines

166608 636x358

SP17-GNI-fig19_215161-636x358.jpg. Copper-bearing tourmaline acquired on the secondary market — Copper-bearing tourmaline acquired on the secondary market

SP17-GNI-fig47_215187-636x358v2.jpg. Fashioned Nigerian indicolites

SP17-GNI-fig21_215157-636x358.jpg. Black opal cabochon from Lightning Ridge — Black opal cabochon from Lightning Ridge

SP17-GNI-fig46_215190-636x358.jpg. Rubellite rough

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This Month's

Featured Gems

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PERIDOT

Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem.

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FANCY COLOR DIAMOND

Dazzling brilliance. Captivating color. These are the planet’s most valued gems.

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DIAMOND

Diamonds are among nature’s most precious and beautiful creations.

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EMERALD

Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine.

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CITRINE

Citrine is the transparent, pale yellow to brownish orange variety of quartz.

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