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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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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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Dyed-bone cabochon
Dyed Bone as a Red Coral Imitation

A specimen presenting as red coral is revealed to be dyed bone.

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Dyed marble imitation of purple sugilite
Dyed Marble as a Purple Sugilite Imitation

Investigation of a purple bangle identified it as a dyed marble imitation of sugilite.

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Dyed green marble imitating jadeite
Dyed Green Marble Imitating Jadeite

What appeared to be high-quality jadeite was actually dyed green marble with calcite as the main mineral.

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Imitation Larimar

One of these contributors (PG) recently acquired a 3.91 ct drop-shaped cabochon, purchased in India as a Larimar imitation, that consisted of a ceramic material.

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Boron Carbide: A New Imitation of Black Diamond

The Gem Testing Laboratory in Jaipur identified a black diamond-like specimen as boron carbide, a ceramic material typically used in nuclear, military, and aerospace applications.

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