Black Tourmaline has been used throughout history for protection: Ancient peoples saw Black Tourmaline as a shield against negative spirits and destructive forces. Today, Black Tourmaline reminds us to let go of our own negative thoughts and work to correct self-destructive patterns of behavior. A stone for turning around one's attitude and attracting positive energy into our lives. Black Tourmaline is a crystal that is used in Chakra healing and is particularly good for the Base Chakra. Approx. 3-4”