Representing the epitome of Art Deco’s most creative period and the quintessence of Cartier’s clockmaking, Sotheby’s is proud to present this rare and exceptional bejewelled Cartier Art Deco gem set and diamond Mystery Clock, ‘Le Ciel’, 1928 (estimate HK$10,500,000–14,000,000 / US$1,360,000–1,810,000) at the upcoming Magnificent Jewels & Jadeite auction on 4 April 2017. This special collection of clocks produced by Cartier between 1922 and 1931 incorporated antique Chinese jade carvings from the 18th and 19th centuries. ‘Le Ciel’ is one of only thirteen clocks from the collection still known to exist.