So, jade is actually a wide range that includes two separate stones. Nephrite is silicon of magnesium. This is old, original Jade, in which all the old parts are. There is a relative newcomer jade, which comes from Burma and by 1784 no one knew in China. This was pure white nephrite which the King of China used as a tool to communicate with heaven.
This was the nephrite, whose formal instrument was used and which used the history of Chinese art and iconography. The nephrite is the most difficult stone on Earth: it weighs fifty tons for a solid-inch nephrite crush. Due to its cruelty, they wear very well, and even the ancient authentic jade bracelets often appear in good condition. However, crystalline texture is formed in jade and it breaks relatively easily.