The jade disc is of compressed rounded square form, with etch marks on each corner, pointed towards the center round hole, one stringing hole on top, the jade is of yellowish-celadon color tone with mottled interior.|Shang Dynasty period.||Length: 2 5/16 in (5.9 cm) Width: 2 5/16 in (5.9 cm)|商 方形璧|白玉為材，瑩潤皎白，雙面工，呈方形，上方雕一小孔，用作佩戴之途。整器線條流暢，亦古亦雅，令人讚歎。"以玉作六器，以禮天地四方:以蒼璧禮天，以黃琮禮地，以青圭禮東方，以赤璋禮南方，以白琥禮西方，以玄璜禮北方"。