A diamond, rubellite tourmaline and yellow sapphire necklace, by David Webb. Photo: Christie's Images Ltd 2013

Of foliate motif, designed as a graduted cluster of circular-cut diamond leaves, set with variously-shaped rubellite tourmalines and yellow sapphires, mounted in 18k gold and platinum, circa 1965, 13¼ ins. Signed Webb for David Webb. David Webb

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