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Metal-coated crystals are artificial products made by coating crystals, such as quartz, with metal to give them an iridescent metallic sheen. Crystals treated this way are used as gemstones and for other decorative purposes. Possible coatings include gold, indium, titanium, niobium and copper. Other names for crystals treated in this way include aqua aura, angel aura, flame aura, opal aura or rainbow quartz.