Hetian jade is of course good. It is a kind of nephrite, commonly known as real jade, and one of the four famous jades in China. Hetian jade can be analyzed and judged from its jade color, luster, compactness, cracking and dyeing. Some people think that jade contains many trace elements beneficial to human body, such as zinc, magnesium, iron, copper, chromium, manganese and cobalt. Through the research on the health-preserving mechanism of jade, the trace elements contained in wearing jade can be absorbed by human skin, producing a special "photoelectric effect" to concentrate energy storage, forming an electromagnetic field equivalent to a resonator in an electronic computer, which resonates with the human body, thus making various physiological functions work more harmoniously.