The jade carved bi disc is of flattened form with jagged edges similar to a gear, the center bears a hollow hexagonal hole, body carved with ruyi patterns, the jade is of yellowish-brown color tone with russet and slight translucency.|Han Dynasty period.||Height: 1/4 in (0.6 cm) Diameter: 2 1/4 in (5.7 cm)|漢玉璧|白玉沁黃，玉質溫潤，工藝技術成熟。扁平體，出牙狀，中間一六邊形孔，有小定位孔。外緣正勢出十牙，牙形大小均同，形線一致。形質規巧，極富裝飾性。