商 玉圭|The jade plaque is of rectangular form, surface incised with straight lined patterns, one end bears a stringing hole, the jade is of black and white color tone with russet.|Shang Dynasty period.||Height: 1/4 in (0.6 cm) Length: 8 1/2 in (21.6 cm) Width: 2 1/10 in (5.3 cm)|玉圭，古玉器名。古代帝王、諸侯朝聘、祭祀、喪葬時所用的玉製禮器，為瑞信之物。白玉質，局部受水銀沁，裝飾平行弦紋，下方一穿孔，玉圭尖首較常見，此玉圭為少見平首造型。