Black Tourmaline Prism For Protection From Negative EnergiesStone for Positive Energy, Healing, Clarity, Protection, Happiness, Serenity, Strength, Purity, Balance & Flexibility. BENEFITS OF BLACK TOURMALINE World's known stone for protection from negative energies. Black Tourmaline absorb negative energies and provide protection from negative magnetic, electrical fields and also from the negative people. It gives emotional strength, mental stability, intelligence and exuberance. Black Tourmaline is excellent