BOUCHERON (setting) 18K (750) gold and platinum cross ring, set with a rounded old-cut diamond, an oval emerald and smaller old-cut diamonds. Signed Boucheron mount. French work, 1950s. Finger size: 53. Diamond dimensions: 8.9x8.9x4.6 mm approx. Emerald weight: 1.62 ct; dimensions: 6.3x8.1x5.4 mm approx. Gross weight: 8.3g (bumps, missing, emerald to be tightened). The emerald is accompanied by a GEM-Paris pre-report (2025) attesting: Colombia origin, resin and oil, moderate. A Boucheron (monture) diamond and emerald (resin and oil moderate) ring