Black tourmaline is said to be one of the best crystals for protection. It is known for its ability to deflect and repel negative energy, both as a psychic shield and in the physical plane. Some believe that placing pieces of black tourmaline around the perimeter of a property will repel any person who approaches the property intending to cause harm.
Black tourmaline is also said to be good for dispelling and deflecting environmental pollutants and radiation. It has a purifying and grounding energy that is well utilised when placed around the workspace, especially in areas where a lot of electromagnetic radiation might be present. Carrying a piece of black tourmaline on your person will act as a powerful talisman of protection.