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(about 3500-2000 BCE). During the Shang dynasty (c. 1600-1046 BCE), Bi (circular perforated jade) and Cong (square jade tube) appeared, which were presumed to be sacrificial utensils, representing the sky and the earth. In the Zhou dynasty (1046-256 BCE), due to the use of higher hardness engraving tools, jades were carved more delicately and began to be used as a pendant or ornament in clothing. Jade was considered to be immortal and could protect the owner, so carved-jade

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