Black Tourmaline Black Tourmaline, a member of the Tourmaline family, is a protective stone which repels and blocks negative energies and psychic attack. Black Tourmaline also aids in the removal of negative energies within a person or a space. Black Tourmaline will cleanse, purify, and transform dense energy into a lighter vibration.. size of average piece is around 2 inch and 4 oz. when you are buying with lb. you get mixed random pcs Very big and nice pcs checked one by one before shipping out check our reviews)