A ring 800/1000 gold set with an old brilliant cut diamond weighing approximately 4 ct., colour grade O~P, VVS purity and weak fluorescence Portuguese signs of use Lisbon hallmark (1938-1984), Claudino de Oliveira maker's mark (1938-1973) Dimensões (altura x comprimento x largura) - 8 (15 mm) cm; Peso - 24,2 g. Notes: vd. VIDAL, Manuel Gonçalves; ALMEIDA, Fernando Moitinho de - "Marcas de Contrastes e Ourives Portugueses (1887 a 1993)", IN-CM, 1996, nºs 26 and 411.