Rainbow Obsidian is a natural variety of Obsidian that appears black in dull light, but when it is hit with bright light then beautiful, bright purples, greens, pinks and even blues appear. The colours within this volcanic glass are caused by reflections off the microscopic bubbles and nanoparticle inclusions of minerals such as Magnetite. The most well known locality for Rainbow Obsidian is Mexico, although locations in the US have produced beautifully coloured specimens.

Rainbow Obsidian can help to cut ties to the past and access the deep seated root of emotional issues. This crystal is believed to bring hope and new energy, and can help to relieve depression by stimulating optimism and help to shift negative thought patterns, promoting a more positive outlook on life. It's also said to be a highly protective stone, shielding the wearer from negative energies and psychic attacks.