18K (750) white gold ring set with an old-cut cushion diamond surrounded by calibrated rubies, the shoulder adorned with rounded old-cut diamonds. French work of the 1920s. Finger size: 48. Diamond size: approx. 7.8 x 8.2 x 4.4 mm. Gross weight: 4 g (traces of cutting). A French 1920 old cut diamond and rubies ring