18ct white gold, lacquer, rubber and diamond 'Class One' ring, Chaumet, the 10 mm wide half round band supporting to the inside a vulcanised white rubber hoop, the front centring a rectangular-shaped plaque pave-set with brilliant-cut diamonds flanked by a continuous line of lacquered plaques, size 52 ( L1/2), signed Chaumet, maker's marks, numbered 878752.