Black Tourmaline is believed to be the most Protective and Grounding of all stones. Shamans and Medicine Masters have been using it for eons to help to heal all kinds of diseases and to keep negativity away. According to lots of holistic practitioners and researchers Black Tourmaline helps in neutralizing EMF (Electro Magnetic Frequency) Radiation (Electro Magnetic Pollution) due to its property in transmuting energy (Piezoelectric and Pyroelectric properties).