Samurai bracelet Masamune Date (japan import) Inner Size: Approx. 17 cm Carved Crystal and Back Onyx Black Onyx is said to transform negative energy and help reduce the drain of personal energy. It is also said to help in aid the development of emotional and physical strength, especially during times of stress, or grief. Clear Crystal is said to be one of the most strongest stones when it comes to healing powers. The clear crystal is known as the stone of power, amplifying energy and intuition.