Wang Shi, a medicinal jade, is a kind of dark green jade produced in Tibet and is called "Wang Shi" among the people. In jewelry works, the standard name of dark green jade is serpentine jade. It is called Yaowang Shi because it is rich in minerals such as magnetite, actinolite, calcite and biotite, and has long been included in the treasure house of traditional Chinese medicine. Most of these magical mineral drugs have the function of tonifying yang, and many health functions such as magnetization, detoxification and aphrodisiac. They also contain 26 minerals and trace elements beneficial to human body, such as calcium, magnesium, iron, zinc and selenium, as well as active substances.

Although the original color of dark green jade is only white and green, it has evolved into black after a long geological process and is called "Black Bao Gong". Its precious secondary color black is also beneficial to human health. Because there is a theory that "five colors enter the five internal organs" in TCM health preservation. Accordingly, the black color of dark green jade enters the kidney, which is beneficial to the health of human renal function.