The archaic jade bi ornament carved in the form of a flattened disc, with natural celadon-green color tone and russet on the surface, with naturally layered interior.|Longshan Culture period.||Diameter: 2 1/4 in (5.7 cm)|龍山文化 玉珀|此玉珀精雕细琢而成，玉质细腻，玉珀为圆形，环壁较宽，浑然天成。通体光素无纹饰，却是无纹胜有纹，素雅无纹的玉珀更加体现玉料本质的纯粹美感。