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, so it is called "Yakuo Stone" in folk medicine. Serpentine is a hydrous magnesium silicate mineral. The color is mainly green, and it belongs to the monoclinic and orthorhombic systems. It is usually scaly, fibrous, or massive. - Material: Natural Serpentine - Color: Green - Design: Bangle - Inner Diameter: 58mm Thank you for viewing.