Aura crystals are created by electrostatically coating crystals, such as quartz, with precious metals that imbues them with an irresistibly iridescent metallic sheen. Crystals treated this way are used as gemstones and for other decorative purposes. Possible coatings include Gold, Indium, Titanium, Copper and more. Sometimes the specific added metals impart heavy doses of color and so the crystals may be named accordingly, with names such as Aqua aura, Angel aura, Flame aura, Tangerine aura, Opal aura or Rainbow quartz.