Yazhang is a sacrificial vessel in primitive society. This vessel is made of sapphire, with natural color, no grain of light, simple and elegant, elegant lines, delicate carving, and extremely thin. Double fork, sharp blade, long support, short inside, with a hole in it. 牙璋為原始社會祭祀的禮器，是以其特殊功能作用於禮制王權性質的古代中國的奴隸社會，文獻記載，「以赤璋禮南方」，還有天子巡狩時祭祀山川以及發兵所用之符，即用玉璋。本器青玉製成，沁色自然，光素無紋，古樸雅緻，線條優雅，琢磨細膩，且極其纖薄。雙叉，尖刃，長援，短內，穿有一孔。