夏代牙璋, L51cm, W.12cm。璋一般由援(鋒刃),欄(作成扉牙狀的繩索系痕部分),內(木柄鑲裝部分)組成。 器物形態當源自戈、鉞、戚一類兵器。 璋為中國古代禮器六器之一最早見於夏代二裡頭文化遺址。本玉璋上端为七个尖峰,中下方两边各有七锯齿,两面各有两行浅浮雕菱形回纹, 全器底子極端平整, 拋光尤為細膩, 全器有多處溶蚀孔。Carved with green tone jade, the object is a zhang with seven shape points at the end, at the lower part of the blade, two low relief carving of rhombus circling cloud motif which is still popular the Shang and Western Zhou Dynasties. With mastery workmanship, this zhang is extra well polished. Antiquity evidence is several natural dissolved pits.