First, nature:

1, the night pearl can be distinguished by light. If you aim at the night pearl for fifteen minutes, it can last for dozens of hours.

2, there is phosphorescence, phosphorescence refers to the attenuation of light that can be felt after the light stops.

3, the color is gorgeous, translucent, and it can emit light by itself without any light, and the light energy is great.

4. Phosphorescence is the function of external light source, while fluorite can emit light by itself.

5. Observe its luminous length, uniformity, half-life and afterglow.

Second, man-made

1. The fluorescent powder is filled in the non-luminous fluorite cracks and only emits local or linear light.

2. After the luminous part passes through the light, the time is short and fleeting.

3, full of light, clear flaws, obvious traces, easier for the naked eye to see through.

Extended data:

Wu Guozhong, former dean of Jewelry College of China Geo University and former vice president of China Gemstone Association:

The brighter and more durable the luminous pearl is, the higher the price is.

Natural luminous pearls include fluorite luminous pearls, diamond luminous pearls and marble luminous pearls. They can emit light because they contain some rare earth elements or their internal structures have changed, so that once external energy is given, internal electrons can move in the dark, and the movement speed is slow, and it takes a long time from high to low, so they can continue to emit light.

Liu, a researcher at Guangzhou Institute of Geochemistry, China Academy of Sciences:

Fluorite luminous pearl has no place in gemology.

Its value is more reflected in culture.

The aesthetic appreciation angle of orientals is different from that of westerners. Westerners like all kinds of mineral crystals with perfect crystal form, all kinds of animal and plant fossils and meteorites in geological times. Tian Huangshi, Yan Shi and Yu Huashi, whom China people are keen on, are not.

Orientals, especially China people, have a long cultural origin, but what we advocate is that ancient things are played by emperors or used exclusively by royalty, and recorded in ancient books. Therefore, the promotion of fluorite night pearl probably lies in its cultural significance.

Baidu encyclopedia-night pearl