Winter Egg expected to sell for >20 million pounds. Emperor Nicholas II commissioned it in 1913. Designed by Alma Theresia Pihl and Albert Holmström. Made of rock crystal with diamond-set snowflake motifs. Features frost interior and white-quartz anemones. Only six Imperial Easter Eggs remain in private collections. Last sold in 1994 for 7.26 million Swiss francs. Sold again in 2002 for 9.57 million US dollars