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Duncan Pay
Trapiche and More...

Colombia’s unique trapiche emeralds exert a fascination for many gemologists.

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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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Dumortierite as sapphire
Dumortierite-Quartz Rock Presented as Sapphire

The Gem Testing Laboratory of Jaipur, India, received for identification an opaque blue specimen, submitted as sapphire.

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CVD Synthetic Diamond
Undisclosed Samples of Large CVD Synthetic Diamond

In mid-2012, one of the international diamond grading laboratories in Antwerp reported undisclosed CVD synthetic diamonds, causing a stir in the diamond industry.

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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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Separating Natural and Synthetic Rubies on the Basis of Trace-Element Chemistry

Natural and synthetic gem rubies can be separated on the basis of their trace-element chemistry.

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Gemological Properties of Near-Colorless Synthetic Diamonds

Examination of 51 colorless to near-colorless synthetic diamonds from all known sources of production confirms that they can be distinguished from similar-appearing natural diamonds on the basis of their gemological properties.

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Copper and Tenorite Inclusions in Cuprian-Elbaite Tourmaline from Paraíba, Brazil

Inclusions of native copper and tenorite (CuO) were found in grayish green elbaite from São José da Batalha, Paraíba, Brazil.

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Majorica Imitation Pearls

The Majorica S.A. product is remarkably similar in appearance to saltwater cultured pearls.

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Mildly Radioactive Rhinestones and Synthetic Spinel-And-Glass Triplets | Gems & Gemology

Low levels of radioactivity were found in some greenish yellow to yellow-green (peridot-like) synthetic spinel-and-glass triplets, mirror-backed glass rhinestone chatons, and fully fashioned glass rhinestones.

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