A sapphire and diamond ring, by Jean Schlumberger, Tiffany & Co. Photo Christie's Image Ltd 2013

Set with a pear-shaped sapphire, weighing approximately 6.32 carats, within a circular, marquise and single-cut diamond bee surround, mounted in 18k gold and platinum Signed Schlumberger for Jean Schlumberger, Tiffany & Co. Estimate $15,000 – $20,000

Christie's. NEW YORK MAGNIFICENT JEWELS AND THE PRINCIE DIAMOND. 16 April 2013. New York, Rockefeller Plaza.