A Solitaire Ring 500/1000 platinum set with brilliant cut diamond with approximate weight of 5.70 ct., colour degree O~P and clarity VVS, weak fluorescence Portuguese signs of use Lisbon mark (1938-1984), José Francisco Franco maker's mark (reg. 1933) Dimensões (altura x comprimento x largura) - 14 (17 mm) cm; Peso - 6,9 g. Notes: Provenance: Jewelry Collection of a Soprano of the São Carlos National Opera House, Lisbon.