A black diamond weighing 88 carats is presented in Shanghai, east China, Oct. 26, 2020. With an estimated value of 37 million US dollars, the diamond from Paris will be on display during the upcoming third China International Import Expo (CIIE) in Shanghai. (Xinhua/Fang Zhe)

Media workers take pictures of a black diamond weighing 88 carats in Shanghai, east China, Oct. 26, 2020. With an estimated value of 37 million US dollars, the diamond from Paris will be on display during the upcoming third China International Import Expo (CIIE) in Shanghai. (Xinhua/Fang Zhe)

A black diamond weighing 88 carats is pictured next to a 5-carat diamond in Shanghai, east China, Oct. 26, 2020. With an estimated value of 37 million U.S. dollars, the diamond from Paris will be on display during the upcoming third China International Import Expo (CIIE) in Shanghai. (Xinhua/Fang Zhe)

A black diamond weighing 88 carats is presented in Shanghai, east China, Oct. 26, 2020. With an estimated value of 37 million US dollars, the diamond from Paris will be on display during the upcoming third China International Import Expo (CIIE) in Shanghai. (Xinhua/Fang Zhe)

A black diamond weighing 88 carats is pictured in Shanghai, east China, Oct. 26, 2020. With an estimated value of 37 million US dollars, the diamond from Paris will be on display during the upcoming third China International Import Expo (CIIE) in Shanghai. (Xinhua/Fang Zhe)