The "Nine Eyes Stone" is as long as a person's index finger and as thick as his thumb. Its color is black as jade, black is very regular, and it is oval and white, and it goes on and on, often nine times, like the human eye. In some places, the more laps, the higher the value. A traditional concept in Tibetan society holds that some rare gems have many special functions, including protecting the body from evil spirits, that is, wearing this gem can prevent monsters from invading and preventing the harm caused by evil spirits, such as some strange diseases. People love a kind of gem named "Si", and there is a mysterious legend about it among the people. Today, the importance of "four" in society, its high price and the role of mysticism are amazing! Fakes are rampant.