The Opals in this collection are Triplets. These are real Opals on a thin slice of Black Obsidian to add depth and vibrancy and a thin slice of Quartz over the top to magnify the colour of the Opal. Black Obsidian was first found in Ethiopia by a Roman man called Obsidius, according to Pliny the Elder who wrote about him in his book Naturalis Historia. It is referred to as Black Obsidian, Black Volcanic Glass or Obsidian Stone. Quartz is the most amazing healing stone of all. It is a natural form of Silicone Dioxide. Some call it Rock Crystal and it is a transparent and hard mineral.