Qing Dynasty Carved in the form of a triangular mountain, the seal face is carved with six characters reading zi zi sun sun wan nian yong bao. 7.5cm (3 in) high.Footnotes清 藍寶石印 篆書「子子孫孫萬年永寶」印文 See a related sapphire carving of a finger-citron, Qing dynasty, from the Qing Court Collection, illustrated in The Complete Collection of Treasures of the Palace Museum: Treasures of Imperial Court, Hong Kong, 2004, no. 57. 參考一件相似的北京故宮藏藍寶石印， 見《故宮博物院藏文物珍品全集·宮廷珍寶》，香港，2004年，編號57。