The jade carved bi disc is of circular form, the surface carved with chilong dragons on outer rim, circular grain patterns on the inner side, the reverse carved in similar motif, with addition chilong mounted outside of the disc edge, the jade is of celadon color tone with russet and stone veins.|||Length: 6 1/4 in (15.9 cm) Width: 6 in (15.2 cm)|玉璧|玉料通體淡黃色沁，玉質溫潤。紋飾分為三層，出廓雕龍紋，外層為減地饕餮螭龍紋，內層為排列整齊的穀紋，原始社會晚期及夏、商、西周作為禮器的玉壁，大多光素無紋或僅有簡單紋飾，春秋以後玉壁的裝飾較以往豐富，為上等玉璧。