Obsidian: The Stone of Protection and Purification Obsidian is a beautiful black gemstone that is known for its ability to absorb and transmute negative energy. It is also said to promote grounding, protection, and truth. Here is a tip on how to place obsidian near your bed to absorb and transmute negative energy: Place a piece of obsidian under your bed or on your nightstand. You can also place a piece of obsidian in each corner of your bedroom. As you sleep, the obsidian will absorb any negati