Size Inner Diameter: 63.9mm Width: 10mm Length: 36.4mm This is Sha Tai Cui, also known as beauty jade (also called She Tai Yu). It is said to be the oldest natural stone in China. Origin: Inner Mongolia, China The main component of She Tai Cui is silicon dioxide, SiO2 quartz rock jade. The density is 2.659/cm3 and the hardness is 7, falling within the category of jadeite. It is also often used for carving. Excavated since 2007, it has properties similar to jade, and was officially named "She Tai Cui (shē, tài, cuì)" after the local name "She Tai Zhen" with the addition of "翠" (cui, meaning jade). The aging process is more noticeable than with jade, allowing you to enjoy a greater sense of luster and shine. Compared to jade, it has a richer color palette, is easier to bring out the luster, and is relatively more affordable. It contains a variety of trace elements and is said to balance the mind and body, and provide a calming effect. It becomes more lustrous with daily handling. ☆Photographed with indoor lighting, and no photo processing filters have been used. All accessories handled here are made by carving natural stones from raw stones. There is no dyeing, composite materials, heat treatment, or oil impregnation treatment. Due to the nature of natural stones, there may be fine scratches, abrasions, cloudiness, and micro-cracks that occur over time. Please make your judgment based on the photos. These items were selected one by one by my family and obtained overseas. They are being offered for sale because they are not being used. Please note that there may be some errors due to amateur measurements. Please understand this before purchasing. Each item is one-of-a-kind, so refunds, returns, and exchanges are not possible. When shipping, it will be sent with a box, but the box is only for preventing breakage, and you cannot choose the box. Please understand that it is not a product box.