An emerald and diamond ring, by David Webb. Photo: Christie's Images Ltd 2013.

Set with a sugarloaf cabochon emerald, within a circular and old European-cut diamond surround, with sculpted 18k gold detail, mounted in 18k gold and platinum, circa 1965, in a David Webb black suede pouch. Signed Webb for David Webb. Estimate:  $30,000 – $50,000

With report CS 56153 dated 5 August 2013 from the American Gemological Laboratories stating that it is the opinion of the Laboratory that the origin of the emerald would be classified as Colombia. Clarity Enhancement: Minor to Moderate, Traditional

THE ESTATE OF THE HONORABLE NOREEN STONOR DREXEL, NEWPORT, RHODE ISLAND

Christie's. MAGNIFICENT JEWELS. 15 October 2013. New York, Rockefeller Plaza.