Legend has it that when Cixi died, she put a night pearl in her mouth, which is said to keep her bones from melting. 1928, Sun Dianying, then commander of the 12th Army of the Sixth Army of the National Revolutionary Army, led an army to blast the Ding Dong Mausoleum, and looted the rare treasures in the Mausoleum. The luminous pearl in Cixi's mouth has not been spared.

The night pearl is a rare gem, which was called "following the pearl", "hanging the pearl", "hanging the ridge" and "bright moon pearl" in ancient times. Usually, the luminous pearl refers to fluorescent stone and luminous stone.

It is formed by some luminous substances in the earth after tens of millions of years, from the initial volcanic magma eruption to the later geological movement, gathering in the ore.

Stones containing these rare luminous elements, after processing, are what people call the night pearl, often with yellow-green, light blue, orange-red and other colors. Fluorescent stone under white fluorescent lamp will emit beautiful fluorescence, which is obviously weak in the day and strong at night.

"Night Pearl" is a kind of natural gem, which can be seen clearly by human eyes in the dark and can glow by itself.

Identification method:

Nature:

(1) bright 15 minutes later, light gray fluorite that can continuously emit light for dozens of hours.

(2) Phosphorescence can not only produce the imitation effect of the night pearl.

(3) Bright colors, translucency, permanent active luminescence without any illumination, and large light energy.

(4) It is necessary to distinguish the fluorescence and phosphorescence of fluorite. Phosphorescence is the function of external light source, which can keep a certain luminous time after removal.

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

Manual:

(1) The fluorescent powder is filled in the cracks of fluorite which does not emit light, and it only emits light locally or linearly.

(2) After the light-emitting part is illuminated, the time is short and fleeting.

(3) Filled with luminescent materials, the defects are clear, there are obvious traces, and it is easy for the naked eye to see through.

Due to the high value of pure natural night pearl, we should take a serious and earnest attitude when identifying the authenticity, and have the identification certificate issued by the authoritative national gem testing institution as the basis.