BLACK OBSIDIAN GEMSTONE BRACELET NEW ELASTICIZED ONE SIZE FITS MOST Black Obsidian The Stone of Truth Some believe that black obsidian can reveal secrets about the universe and a person's inner psyche. A Protective stone Black obsidian is thought to have protective energies that can help guard against depression. It is also believed to be able to block, absorb, and transform negative energy. A Stone of clarity Black obsidian is thought to be able to release blockages that are emotional, physical, and spiritual. It is also believed to help draw out stress and tension.