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A staff member presents man-made diamond jewelry at Zhengzhou Sino-Crystal Diamond Co., Ltd. in Zhengzhou, central China's Henan Province, Jan. 30, 2019. (Xinhua/Feng Dapeng)

A staff member presents man-made diamond jewelry at Zhengzhou Sino-Crystal Diamond Co., Ltd. in Zhengzhou, central China's Henan Province, Jan. 30, 2019. (Xinhua/Feng Dapeng)