Black Tourmaline crystal is a the stone I would choose for protection against negative energy of all kinds… as well as being an incredible spiritual grounding stone.
Because of its protective properties, tourmaline encourages positive attitudes, good luck and happiness, regardless of the circumstances that you find yourself in. This is a great stone for everyone to carry, and terrific for healers to use in their practice.
Dimensions: This is a smaller sized stones because tourmaline is soft and fragile. This by no means diminishes its power.
PERFECT USE: Place a piece of tourmaline in all four corners of a room to act as a shield.