18K (750°/°°) white gold forçat link necklace, centred on a platinum (850°/°°) tonneau motif adorned with a lapis lazuli plaque surrounded by lines of old-cut and 8x8 diamonds and calibrated sapphires. Probably the face of a converted Art Deco watch case, minor wear to some stones Total length: approx. 40 cm - Gross weight: 7.5 g