Aqua Aura is a term used to describe a natural Quartz Crystal which has been coated with gold.
It is created in a vacuum chamber in which the Quartz is heated and Gold vapor is added, the Gold then fuses to the surface of the Quartz.
This process is undertaken with a range of minerals including titanium, silver and platinum.
These are variously known as Titanium Quartz, Rainbow Quartz, Ruby Quartz, Rose Quartz and Opal Aura Quartz. The title often being dependant on individual preference.