Aura Amethyst!
Aura Amethysts are so cool! To make aura stones, gemstones and crystals are placed into a vacuum chamber that is heated to 1472°F (800°C) at which point vapors of different metals are added which allows the metal atoms to bond to the surface of the stones giving you that amazing iridescent sheen!
The colors differ due to the types of metals that are added to the chamber. The types of metals can include gold, titanium, platinum, magnesium, silver, and nickel.
What is your favorite color of Aura Amethyst?