Ring in yellow gold 750 thousandths, set with a cabochon-cut opal weighing approx. 0.70 ct, shouldered by two small pear-cut cabochon-cut sapphires and four modern brilliant-cut diamonds. M. O. French: HOURDEQUIN-GRINGOIRE (registered in 1965). Opal size: 8.6 x 6.1 x 2.5 mm Total estimated diamond weight: 0.04 ct Finger size : 54 Gross weight: 6.4 g