For an almost identical rock crystal snuff bottle carved with the Eight Daoist Emblems, see Christie's New York, 19-20 September 2013, lot 1627. Another very similar snuff bottle, but carved with the Eight Buddhist Emblems, is illustrated by H. Moss, V. Graham and K.B. Tsang, A Treasury of Chinese Snuff Bottles, The Mary and George Bloch Collection, Vol. 2, Part 2, Quartz, Hong Kong, 1998, pp. 416-18, no. 334.