Black Tourmaline- Protection, Cleansing, & Grounding. Black Tourmaline is said to be highly protective from negative energy and negative influences. This stone can absorb negative energy in a person’s space and then release the energy back out as positive energy. As a grounding stone it is great for soothing anxiety and tension. Black Tourmaline can also purify and cleanse the emotional body and remove negative thoughts, and feelings of unworthiness.