The traditional properties of Tourmaline include grounding spiritual energy, balancing chakra’s, and forming a protective shield. Black Tourmaline blocks curses, psychic attack and ill-wishes. It grounds energy, increases physical vitality, disperses tension and stress and clears negative thoughts. This stone stimulates positive attitude and altruism and practical creativity. Its a perfect stone for a grid around the house for protection. Approximately 0.8cm. All natural stones can vary in shape, colour and size.