The archaic jade ornament is of flattened form, openwork carved to depict a mythical mask, the jade is of greyish-celadon color tone with slight russet.|Hongshan Culture period.||Width: 3 1/2 in (8.9 cm)|紅山文化 玉|器体为扁平的长方形，中间有大小不一左右对称的5个孔。双面加工，两面纹饰相同，整个器身较薄。纹饰均以打洼法饰出，此器加工难度大，工艺水准高。