BIG SAPPHIRE AND DIAMOND BAND RING IN PLATIUM LARGE SAPPHIRE AND DIAMOND BAND RING in platinum, embellished with two cushion-cut sapphires of approx. 2.80 ct, a central old-cut diamond of approx. 0.90 ct and old-cut diamonds of approx. 3.50 ct, signed "Fontana Roma", hallmark PT, size 16/56, gr. 29