Natural and alluring, Obsidian is not a gemstone, but instead a volcanic glass. Obsidian has been utilized for jewelry and other decorative purposes for thousands of years. Pre-Columbian Mesoamerican cultures carved many tools and other objects from Obsidian.
Obsidian is formed from quickly cooling magma, or lava flows on the Earth’s surface. Sometimes obsidian can have a slight iridescence due to inclusions of mica and other material. Significant sources include Peru and the United States.