Square Plaque with Chi-dragon Design, Ming dynasty (1368-1644). Jade. Length 3.4 cm, Width 2.6 cm. Unearthed from the joint tomb of Gu Cunming and Zhu Shoucheng in Baoshan, Shanghai in 1966. Shanghai Museum.

Legend had it that the Zigang rectangular pendant was invented by the jade carving master Lu Zigang of Suzhou in the Ming dynasty, which was full of literary charm and highly pursued for a time. The jade piece is carved with mutton-fat white jade, decorated with a Chi-dragon (hornless dragon, one of the nine sons of Dragon) design on both sides in different postures. With meticulous cutting techniques, this piece of work provides valuable information for people today to learn about the original state of Zigang plates of the Ming dynasty.