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A usually colorless artificial gem of crystal, glass, or another material, often with a flat metallic backing to create sparkling facets on the front.
[After the Rhine (translation of French caillou du Rhin, piece of rock crystal gathered from the Rhine (such as used to imitate diamonds) : caillou, pebble + du, of the + Rhin, Rhine).]
(Jewellery) an imitation gem made of paste
[C19: translation of French caillou du Rhin, referring to Strasbourg, where such gems were made]
an artificial gemstone cut from rock crystal or various kinds of brilliant glass or paste, esp. in imitation of a diamond.
[1885–90; translation of French caillou du Rhin]