The cheapest diamond is in Zhaoyuan, Shandong Province, where not only gold is produced, but also some diamonds are produced in China. However, people there don't care much about diamonds, but they care a lot about gold, and the price of gold there is relatively high. Secondly, there are some diamonds and some unusual minerals in Guangrao, Shandong Province. Because the diamond production there is low and the price is low, the price of gold and diamonds is definitely the top price in big cities, and the price of diamonds in no place will be higher than that in Shanghai.