Stone of TruthBlack ~ Protection ~ Stone of TruthBlack. Dimensions 40 x 40mm.  Obsidian protects against negative energies of all kinds, especially if you feel you need to break some sort of curse or hex against you. A very good crystal for grounding and is known as the stone of truth, forcing you to face up to your true self. It will help you remain focused on your goals, keep you alert regarding people who may not have your best interest at heart and will help you release toxins and negativity from your life. Black Obsidian will help you deal with situations and people in your life with strength and courage. Black obsidian also has the gift of prophesy.4 x tumblestones can be used as a grid in a room (a crystal in each corner of the room) to protect or raise the vibration of your space. You can also put with clear quartz to magnify the obsidian