A ring

A ring, 500/1000 platinum, set with a brilliant cut diamond weighing approximately 1.65 ct., colour grade H~I and purity VVS, Portuguese, signs of use, Lisbon mark (1938-1984) and Vergílio Júlio da Costa Correia maker's mark (1935-1948), Dim. - 21 (19,5 mm) cm; Peso - 5,6 g.