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Lab Notes (10) Gem News International (24) Reviews (5) Abstract (1) Feature (5) Micro-World (6)

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Jadeite boulder from Itoigawa, Japan

Japanese Jadeite: History, Characteristics, and Comparison with Other Sources

Ahmadjan Abduriyim, Kazuko Saruwatari, and Yusuke Katsurada, May 5, 2017

Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.

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Paula Crevoshay’s “Yogo Columbine” sapphire pendant

The Role of Silicon in the Color of Gem Corundum

John L. Emmett, Jennifer Stone-Sundberg, Yunbin Guan, and Ziyin Sun, May 7, 2017

Considers the previously unreported but critical impact of silicon on the coloration of gem-quality sapphire.

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Orangy red cordierite.

Unusual Dark Orangy Red Cordierite

Augusto Castillo and Akhil Sehgal, May 8, 2017

A cordierite with a color not seen in the GIA lab is examined in New York.

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Wagnerite, thaumasite, and strontianite.

Three Faceted Collector Specimens

Jonathan Muyal and Nicole Ahline, May 8, 2017

Three mineral species, not previously seen in the Carlsbad lab, are examined.

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IMG - SP17 Brazilian Diamonds 300x169

Brazilian Diamonds: A Historical and Recent Perspective

Darcy P. Svisero, James E. Shigley, and Robert Weldon, May 8, 2017

Recounts the history, geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production.

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Six cuprian liddicoatite tourmalines

Cuprian Liddicoatite Tourmaline

Yusuke Katsurada and Ziyin Sun, May 8, 2017

Identifies 13 copper-bearing tourmalines, which have traditionally been assumed to be elbaite species, as liddicoatite.

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Green HPHT synthetic diamond.

HPHT Synthetic Diamond with Intense Green Color

Paul Johnson and Elina Myagkaya, May 8, 2017

Nickel is found to contribute to the color of a synthetic diamond seen in the New York lab.

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Wavers with calculated color panels.

Pyrope-Spessartine Color-Change Garnet with a High Grossular Component

Ziyin Sun, Jonathan Muyal, and Aaron Palke, May 8, 2017

A color change in rough garnet is observed and plotted in GIA’s Carlsbad lab.

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Amethyst crystals from Morocco

Moroccan Amethyst: Mining and Marketing

Andrew Lucas and Tao Hsu, May 8, 2017

Insight into amethyst mining activity in Morocco.

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Wanlaya Suwannapirom with painted pendant.

Gem Paintings from Thailand

Andrew Lucas and Tao Hsu, May 8, 2017

Paintings created from uncut gem fragments are seen at Tucson’s GJX show.

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