MARCHAK Large cocktail ring in 18K (750) smooth or twisted gold wire, the basket paved with cabochon rubies, round old-cut diamonds on platinum, set with a round cabochon emerald. Signed. French work, 1960s. Finger size: 49/50. Gross weight: 19.8 g The emerald is accompanied by a GEM-Paris pre-report (2025) attesting: Colombia origin, resin and moderate oil. A 1960 Marchak emerald (Colombia, resin and moderate oil) diamond and ruby ring