These are the Aqua Aura gemstone components we currently have in stock. Aqua Aura is natural, clear quartz that has a permanent transparent, somewhat iridescent blue surface treatment. The exact process is a trade secret, but is said to be a combination of heat, pressure and exposure to vaporized pure gold. The gold is permanently bonded to the crystal structure of the quartz, creating the surface color. Since this is a surface treatment, care should be taken not to scratch the surface.