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A yellowish green glass with numerous wollastonite needles similar in appearance to the horsetail inclusions in demantoids.
Wollastonite in Devitrified Glass Imitating Horsetail Inclusions in Demantoid Garnet

A yellowish green specimen with horsetail-like inclusions is found to be glass rather than demantoid garnet.

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Natural inclusions are visible when the assemblage is viewed face-up.
Beryl and Glass Assemblage Imitating Emerald

An unusual assembled stone is examined at GIA’s New York lab.

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Starburst Stone is a colorful new devitrified glass.
Colourful Chatoyant Glass

A devitrified glass reminiscent of Victoria Stone is seen during the Tucson gem shows.

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Rock crystal coated with brown skin.
Coated Rock Crystal Imitation of Ruby

A coated rough rock crystal resembles a purplish red ruby.

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Uneven color and blemishes on low-quality cultured pearl necklace.
Dyed Yellow Beaded Freshwater Cultured Pearls Imitating South Sea Cultured Pearls

A yellow cultured pearl necklace is compared to the work of a producer specialising in freshwater pearls of all colours.

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A green dye concentration observed in beryl.
Dyed Green Beryl

A step-cut beryl is dyed to simulate emerald.

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Sections of imitation boulder.
Imitation Rubellite Boulders

Specimens presented as rubellite tourmaline rough are found to be resin imitations with lead inserts.

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Olive-green serpentine cabochon.
Serpentine Cabochon with Unusual Olive Green Colour

A green cabochon from China resembling jadeite is found to be antigorite, a member of the serpentine group.

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Synthetic Diamond Articles from Gems & Gemmology

When General Electric created the first gem-quality synthetic diamonds in 1971, the first place the company sent them after cutting was to GIA for examination and research. In the 44 years since then, GIA researchers have closely followed the development of laboratory-created diamonds – from those early experiments to the production of commercial quantities in the gem market.

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Synthetic Ruby Overgrowth on Natural Corundum
Article
Analysis of Synthetic Ruby Overgrowth on Corundum

Analysis of synthetic ruby overgrowth on corundum, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.

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