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Dyed Natural Corundum as a Ruby Imitation

The gemological properties of a new ruby imitation, produced by dyeing natural colorless to pale-colored corundum, are described.

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An Examination of Nontransparent “CZ” from Russia

White, pink, and black nontransparent synthetic "cubic zirconia" is currently being manufactured in Russia and marketed primarily in cabochon and bead form.

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Characterization of Colorless Coated Cubic Zirconia (Diamantine)

Over the past several years, diamond simulants have entered the market that consisted of colorless cubic zirconia reportedly coated with a thin layer (e.g., represented to be 30–50 nm) of nanocrystalline diamond particles embedded in a matrix.

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Lepidolite with Simulated Matrix

The authors examine an unusual crystal in matrix.

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The Early History of Gemstone Treatments

The author has uncovered many ancient references to the simulation or enhancement of gemstones.

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Cobalt Glass as a Lapis Lazuli Imitation

The properties of a novel gemological imitation, cobalt glass.

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The Identification of Turquoise by Infrared Spectroscopy and X-Ray Powder Diffraction

Two techniques for identifying natural, treated, and synthetic turquoise are examined.

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The Jade Enigma

An examination of the various simulants of of nephrite and jadeite, and how to separate them from jade.

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A Simple Approach to Detecting Diamond Simulants

Contrasting the physical properties of diamond with colorless specimens to identify the most problematic diamond simulants.

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Cubic Zirconia: An Update

An examination of the skull-melting technique used to produce cubic zirconia, first introduced in 1976, as well as the market status of this diamond simulant and information about its production and quality.

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