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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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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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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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Comparison of golden coral and plastic beads
Golden Coral Imitated by Plastic

A bracelet created to simulate the properties of golden coral is proven to be a plastic imitation.

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

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

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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-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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Composite Amber with an Unusual Structure

This 9.12 gram amber composite featured a combination of natural and imitation amber, accompanied by natural and artificial insect inclusions.

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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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