A few years ago, a gentleman went on a business trip to another place. While browsing at an antique stall, he came across an old white jade piece. It was about the size of a fist, in the shape of a ring, one centimeter thick, with an extremely simple design. Out of curiosity, he casually asked for the price. The stall owner initially asked for 5 yuan, later reduced to 2 yuan, so he bought it, thinking he could use it as a paperweight at home. A few years later, a friend who had some knowledge of antiques visited his house and noticed this jade ring on the desk. Surprised, after learning its origin, the friend informed him that this jade ring might be an ancient jade, with considerable value. The gentleman was skeptical but couldn't bear the suspense, so he sought an expert appraisal through acquaintances. The result showed that it was indeed an ancient jade ring used in rituals, and it dated back at least...