Imitation diamonds such as CZ and moissanite have been popular for decades. Learn about their properties and how they compare to diamonds.
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Learn about Mozambican rubies, including their mining history, characteristics and market demand.
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A yellowish green specimen with horsetail-like inclusions is found to be glass rather than demantoid garnet.
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An unusual assembled stone is examined at GIA’s New York lab.
Read MoreA devitrified glass reminiscent of Victoria Stone is seen during the Tucson gem shows.
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A coated rough rock crystal resembles a purplish red ruby.
Read MoreA yellow cultured pearl necklace is compared to the work of a producer specialising in freshwater pearls of all colours.
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Specimens presented as rubellite tourmaline rough are found to be resin imitations with lead inserts.
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A green cabochon from China resembling jadeite is found to be antigorite, a member of the serpentine group.
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