An art deco diamond and rock crystal dress clip, by Georges Fouquet

The inverted rock crystal arc, centering upon a pierced single and old European-cut diamond fan-shaped plaque, trimmed by a graduated line of collet-set old European-cut diamonds, the terminals decorated with intersecting bands of single and old European-cut diamonds, mounted in platinum and 18k white gold, circa 1930, with French assay mark. With maker's mark for Georges Fouquet, no. 19091 (indistinct). Est. $30,000 - $50,000

Chtistie's. Jewels: The New York Sale. 22 April 2009. New York, Rockefeller Plaza www.christies.com