Due to the rotten rope of wearing a necklace for a long time, beads of various materials were left. There are a large number of beads in various cultural sites and ancient tombs in China from ancient times to the present, but apart from gold or slightly larger beads, both archaeological teams and grave robbers are not too cold in the face of a large number of beads.
Grave robbers are not interested, so they can't buy a lot of money, but the China archaeological team, I think, is worth studying.
Looking through the catalogues of archaeological materials, I found that there is no monograph about Zhu Zhu in China, only one or two monographs.