Lot Essay
The delicate network of natural flaws in amethyst and rock crystal can be described as 'sea-spray', 'net' or 'cracked-ice'. See Hugh Moss, Victor Graham and Ka Bo Tsang, The Art of the Chinese Snuff Bottle, The J&J Collection, Tokyo, 1993, pp. 183-184, no. 102 and 95 for another example and a discussion of this group.