本器青玉雕琢, 形制為虺龍吐信紋雙立柱文鎮, 正面施口銜靈芝之虺龍紋高浮雕, 背面陰刻篆體”孔君玉平兄正文定”.文定，或稱送定、納吉、下插定，又稱「小聘」（「大聘」則指「納徵」或「過大禮」），是古代傳統婚禮的訂婚儀式之一, 本器為文定信物, 雙立柱意涵男女雙方雙姓聯結之意, 虺龍紋表示望子成龍,靈芝則有富貴吉祥之意。《述异记》云：“虺五百年化为蛟，蛟千年化为龙”. 本器古玉跡象為差異風化, 擴散暈沁色及溶蝕孔. Carved with pale tone jade, the object is a double-column connected by high relief serpent-like, flicking tongue dragon carving on the front side, scripts of <孔君玉平兄正文定> incised carving appeared on the other side. The meaning of the script reads < For the engagement ceremony of Mr. Kuong>. Antiquity evidence is differential weathering, diffusive markings, and dissolved pits.