Here is a rainbow aura quartz that is one of the flashiest and most brilliant members of the aura quartz family (aqua aura, opal aura, pink aura, etc.). The color comes from a thin layer of titanium bonded in the lab with the quartz. On this specimen, the smaller crystals covering the sides of the main crystals reflect the light in iridescent colors as the specimen is turned, creating a spectacular and brilliant display of bright rainbow colors.