Empress Dowager Cixi was buried in Ding Dong Mausoleum after her death. She enjoyed all the splendor before her death, but after her death, she was still extremely luxurious, and there were countless treasures buried with her. 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 blow up Ding Dong Mausoleum and looted the rare treasures in the Mausoleum. The pearl in Cixi's mouth was not spared. It is said that bandits opened Cixi's coffin and saw her face as if she were asleep. Sun Dianying recalled: "It was because she had a big pearl in her mouth. This bead separates quickly, but when it is closed, it reveals a green cold light, and you can see your hair within a hundred steps at night. " Bandits pried Cixi's mouth open with bayonets and stole the night pearl.
When the Qing royal family reburied Cixi, they noticed that Cixi's lips were broken, which seemed to be caused by grave robbers taking pearls. After the robbery, Sun Dianying paid bribes everywhere with stolen jewels to get away with it. It is said that he gave this pearl to Song Meiling, and this rare gem in the world disappeared.