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Spring 2015 G&G Examines Blue Spinel, Chinese Jewelry Design and the Latest in Synthetics

G&G Brief presents an overview of the content of the Spring 2015 issue of Gems & Gemology.

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Color Grading “D-to-Z” Diamonds at the GIA Laboratory

This article discusses the history and ongoing development of GIA's color grading system, and explains how its laboratory applies it.

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Synthetic or Imitation? An Investigation of the Products of Kyocera Corporation That Show Play-Of-Color

An investigation of the difference between synthetic opal and opal simulant.

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The Ultimate Gemologist: A Tribute to Richard T. Liddicoat

On this occasion—the celebration of Richard T. Liddicoat’s 50 years guiding Gems & Gemology—it is fitting to review his enormous impact on the field of gemology.

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Paramagnetic Hole Centres in Natural Zircon and Zircon Colouration

This article explores atomic defect centers (color centers) of natural zircon from three localities (North Carolina, the Massif Central in the south of France, and the Ural Mountains of Russia).

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A New Method for Detecting Be Diffusion-Treated Sapphires: Laser-Induced Breakdown Spectroscopy (LIBS)

This article describes the first application of laser-induced breakdown spectroscopy (LIBS) to gemology.

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Technological Development in the 1990s: Their Impact on Gemology

In the last decade, technology has improved how we synthesize, process, identify, and otherwise study gem materials.

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Synthetic Gem Materials and Simulants in the 1990s

The 1990s witnessed important developments in the commercial viability of gem-quality synthetic diamonds.

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Gemstone Enhancements and Detection in the 1990s

Gemstone enhancements and their disclosure became the most important gemological issue for the jewelry trade in the 1990s.

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Celebrating 75 Years of Gems & Gemology

Gems & Gemology, the professional quarterly of GIA, debuted in 1934

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