A jade ceremonial blade (yazhang), Neolithic Period-Erlitou Culture. Photo Sotheby's. the slightly flaring blade with an asymmetrically curved end with beveled edge, the tang broken, the opaque stone of black color. Length 6 7/8 in., 17.5 cm. Estimation...

A jade ceremonial blade (yazhang), Neolithic Period-Erlitou Culture. Photo Sotheby's. the thin blade with a raised rib down the center, flaring slightly towards the arched cutting edge, the base of the tang set with a pair of projections and drilled with...