Ring in 750 thousandths yellow gold, set with a navette-shaped piece of gray mother-of-pearl, highlighted with eighteen modern brilliant-cut diamonds, the gadrooned setting. French work, 1980's. Mother-of-pearl piece: 18.2 x 10.6 x 6 mm Total estimated diamond weight: 0.18 ct Finger: 51.5 - Gross weight: 15.3 g