amond, so rare that there is no fixed price for them. They are almost invisible in the diamond market, appearing only at some high-profile auctions."In 1987, a 95-carat red diamond sold at Sotheby's a...eart was filled only with boundless regret, but it was all too late. The ten-million-dollar tea leaves were mistaken for fake tea and discarded, and the Jade Guanyin, a priceless treasure, had also sh...