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Imitation Larimar

Examination of a 3.91 ct drop-shaped cabochon, purchased in India as a Larimar imitation.

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Obtaining U.S. Copyright Registration for the Elara Square Cut-Cornered Brilliant Diamond

The U.S. Copyright Office granted what is believed to be the first copyright registration covering a gemstone design.

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A New Method for Imitating Asterism

Several gems were recently examined that showed stars with an unnatural appearance or an unusual number of rays.

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Celebrating 75 Years of Gems & Gemology

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

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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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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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Man-Made Jewelry Malachite

Man-made malachite holds much promise for use in stone cutting and the jewelry trade.

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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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