Black obsidian stones have undergone a laser treatment which creates a beauticul rainbow sheen. While some practitioners prefer natural, untreated stones for their metaphysical work, many consider aura stones, with their pure components and synergistic energies, to be the exception to the rule.
Obsidian is quickly cooled volcanic lava. It is a natural glass. In healing circles, it is known as a stone of protection with grounding properties, it reduces fantasies and helps clear subconscious blocks. Absorbs and disperses negativity. Powerful healer for those attuned to it.