A "mystery-set" sapphire and  diamond bracelet,by Van Cleef & Arpels. Photo: Christie's Images Ltd 2012 

Designed as three rows of calibré-cut sapphires, bordered by collet-set circular-cut diamonds, mounted in platinum and 18k gold, 6 7/8 ins., with French assay mark. Signed V.C.A. for Van Cleef & Arpels, no. 133926 - Lot 145. Estimate $50,000 - $70,000

Estete of Lucille E. Davison

A "mystery-set" ruby and  diamond bracelet,by Van Cleef & Arpels. Photo: Christie's Images Ltd 2012 

Designed as three rows of calibré-cut rubies, bordered by collet-set circular-cut diamonds, mounted in platinum and 18k gold, 6 7/8 ins., with French assay marks and maker's mark. Signed V.C.A. for Van Cleef & Arpels, N.Y., no. 56290 - Lot 146. Estimate $50,000 - $70,000

Estete of Lucille E. Davison

Christie's. Magnificent Jewels 17 April 2012 New York, Rockefeller Plaza www.christies.com