The "night pearl" is actually fluorite that glows. Although China is a big fluorite mineral country, there are not many fluorites that can shine at night, so it is precious and priceless. Joseph Needham, a famous British scholar, recorded in his magnum opus "History of Science and Technology in China" that ancient China people loved the night pearl because they thought it was spiritual and a treasure of town houses. So people regard it as a precious wealth. It can control the house and drive away all evil. Some people in India call the night pearl "snake-eye stone", and Japanese scientist Ling Mumin sorted out the gem records at 19 16, calling it a sacred gem.

The luminous pearl is not a gem at all, and its value cannot be compared with single crystal diamond, ruby, sapphire and emerald. People have always had a sense of mystery about it. First, there are many legendary records in ancient books. Second, it "glows".

To sum up, it looks valuable, but it is not.