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Faceted quartz egg.
Exhibition Review: Gemstone Carvings: The Masterworks of Harold Van Pelt

A review of Gemstone Carvings: The Masterworks of Harold Van Pelt at the Bowers Museum in Santa Ana, California.

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Bolivian ametrine crystal.
Ametrine Optical Dishes: Windows into the Effects of Crystal Structure

Optical activity is studied using a polished block of ametrine.

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Bicolored Quartz
The Anahí Ametrine Mine, Bolivia

The Anahí mine, Bolivia, has produced large amounts of amethyst, citrine, and amethyst-citrine for the gem market.

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Anahí mine tunnel
Anahí’s “New” Ametrine

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

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Ametrine Color Blend
Article
Ametrine Description

Transparent, bicolored quartz with the colors of both amethyst and citrine in the same gem is called ametrine or amethyst-citrine.

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Smoky Quartz Ametrine from the Yuruty Mine
Ametrine with Layers of Smoky Quartz

An investigation of these Yuruty mine samples revealed an interesting new aspect to this bicolored quartz.

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Ametrine from Yuruty, Bolivia
Update on Ametrine from the Yuruty Mine, Bolivia

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.

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A Selection of Faceted Natural Ametrines.
Using Conventional Equipment to Separate Natural from Synthetic Ametrine

A summary of the article “A simple approach to separate natural from synthetic ametrine,” by Francine Payette.

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