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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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Plastic opal imitation by Kyocera alongside the company's polymer-impregnated synthetic opal.
New Plastic Imitation Opal from Kyocera

A plastic product that mimics the play-of-color phenomenon of natural opal but has distinctly different gemological properties is now available to consumers.

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

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

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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 specializing in freshwater pearls of all colors.

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Article
Synthetic Diamond Articles from Gems & Gemology

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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Article
An Introduction to Simulants or Imitation Gem Materials

This article provides an overview of synthetic gem materials.

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Glass imitations of Zultanite.
Color-Change Glass as a Zultanite Imitation

Two samples, presented as Zultanite, are revealed to be color-change glass.

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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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A green dye concentration observed in beryl.
Dyed Green Beryl

A step-cut beryl is dyed to simulate emerald.

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