Boucheron Paris diamond cocktail ring. A round old cut diamond is set to centre in an open back rubover square collet setting with a weight of 0.50 carats, flanked by two curved rows of twenty four round old single cut diamonds in open back grain and rubover settings with a combined weight of 0.50 carats. The total approximate diamond weight is 1.00 carat, all set to a heavy truncated concave rectangular yellow gold form with protruding platinum scrolls framing the central raised collet, all flowing down to shaped tapered shoulders with intricate backholing and a solid flat shank. Marked yellow gold and platinum, signed 'BOUCHERON - PARIS.', French, circa 1945.