All tourmalines are said to enhance understanding, increase self confidence, amplifies psychic energies. they neutralize negative energies, dispel fear and grief, and aid in concentration and communication. They can relax the body as well as the mind and aid in the treatment of infectious diseases, anxiety, blood poisoning, arthritis, and heart disease. Healing Properties: these can be an excellent channeling stone for communication with the higher forces. Green tourmaline is said to regulate blood pressure and can strengthen the heart and nervous system. It can also stimulate digestion and strengthen the immune system. Black can protect against high radiation. Blue is told to combat water-retention, promote detoxification of the entire body, strengthen the immune system, as well as reducing throat and bronchial infections. Watermelon is said to alleviate pain, protect the nerve cells and strengthen the immune system.