This cool Yakuo Stone bangle suits men as well. Yakuo Stone is a type of serpentine jade. This jade is a dark green color, gentle and delicate in nature, and contains many minerals necessary for the human body, which is why it is called "Yakuo Stone" (Medicine King Stone) in folk medicine. Serpentine is a hydrous magnesium silicate mineral. Its color is mainly green, and it belongs to the monoclinic and orthorhombic systems. It usually appears in the form of scales, fibers, or masses. - Material: Natural Serpentine - Color: Green - Design: Bangle - Inner Diameter: 64mm (also available in inner diameters of 58mm and 62mm) Thank you for viewing.