Blue Aura Quartz
Aqua aura is a natural crystal that has been coated with gold fumes. It is created in a vacuum chamber from quartz crystals and gold vapor by a process known as vapour deposition. The quartz is heated to 871 °C (1600 °F) in a vacuum, and then gold vapor is added to the chamber. The gold atoms fuse to the crystal's surface, which gives the crystal an iridescent metallic sheen. The process was awarded the United States Patent No. 6997014 on 14 February 2006.