2. Obsidian, also known as "Ten Victory Stones", is a naturally occurring colored glass. Obsidian has always been a crystal. In fact, although its chemical composition is similar to that of crystal, it belongs to volcanic glass, not crystal in a strict sense. Obsidian is one of the seven treasures of Buddhism. Since ancient times, it has been used as an exorcist and amulet, symbolizing friendly love and hope, and helping to eliminate negative energy such as stress, fatigue and turbidity.