18 апр 2500 г. до нашей эры - Jade Cong

Описание:

They used two distinct types of ritual jade objects: a disc, later known as a bi, and a tube, later known as a cong. The main types of cong have a square outer section around a circular inner part, and a circular hole, though jades of a bracelet shape also display some of the characteristics of cong.

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