Natural Black Onyx Hanging Stone. Black Onyx absorbs and transforms negative energy, and helps to prevent the drain of personal energy. Black Onyx aids the development of emotional and physical strength and stamina, especially when support is needed during times of stress, confusion or grief. Black onyx is a protection stone. Its purpose is to help prevent the drain of personal energy while at the same time absorbing and transforming negative energy. Order online now from RozRin Crystals.