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Zambia Cut Citrines
Article
Citrine from Zambia

Large, clean citrine reportedly from the Kitwe deposit in Zambia is a welcome addition to the gem market.

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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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This aquamarine crystal showed iridescence as it is turned under a moving light source.
Mysterious Iridescence in Aquamarine

A rough aquamarine crystal shows an unexpected phenomenon.

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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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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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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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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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CVD, HPHT and Natural Diamonds
Article
Is There a Difference Between Natural and Laboratory-Grown Diamonds?

Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference

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Article
Spring 2019 G&G: Tourmaline Classification, Provenance of Freshwater Pearls, and the Annual Tucson Report

An overview of the Spring 2019 Gems & Gemology content.

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Bands of color swirl across this piece of agate – from black to white to yellow to green to blue to orange to brown.
Article
Gem Cutters Reveal the Beauty of Chalcedony

Master carvers have used chalcedony in jewelry, including cameos and intaglios, since ancient times in Europe and the Middle East.

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