The night pearl is a rare treasure, which was called "following the pearl", "hanging the pearl", "hanging the ridge" and "bright moon pearl" in ancient times. The night pearl is often regarded as the national treasure of the town. Usually, the luminous pearl refers to fluorescent stone and luminous stone. Ancient books record that the night pearl shines beautifully when it burns. It is formed by the accumulation of some luminous substances in the earth in the ore after millions of years, from the initial magma eruption to the later geological movement. After processing, the stones containing these luminous rare elements are what people call the night pearl, which is often yellow-green, light blue, orange and other colors. Fluorescent stone under white fluorescent lamp will emit beautiful fluorescence, which is obviously weak in the day and strong at night. In addition, some handicrafts also use the characteristics of fluorite to make some ornaments called "Night Pearl".