A Ring 500/1000 platinum set with 6 brilliant cut diamonds with an approximate weight of 0.36 ct. and a navette cut one (c. 3 ct.), M colour degree and VVS clarity, weak fluorescence Portuguese signs of use, open rim Lisbon mark (1938-1984), José Francisco Franco maker's mark (reg. 1933) Dimensões (altura x comprimento x largura) - 17 (18 mm) cm; Peso - 5,1 g. Notes: Provenance: Jewelry Collection of a Soprano of the São Carlos Nacional Opera House, Lisbon.