Ox-Headed Agate Cup Inlaid with Goldin Shaanxi History Museum. Unearthed from the Tang Dynasty (618-907) vault in Xi'an in 1970, the ancient vessel is the only piece of jade ware from the Tang Dynasty found so far. It is known for superior craftsmanship that transformed a rough stone into a precious object by following and accentuating the stone's natural shape, grain, texture, and color.[Photo/zhongguociwang.cn]