709 - A diamond and bicolour gold ring

A diamond and bicolour gold ring Bicolour gold, fineness .800 Set with a brilliant-cut diamond weighing approximately 0.17 ct. Lisbon hallmark (1985-2020), goldsmith's mark of Manuel & Fernandes Ldª (reg. 1968), TRISTAR model Size: 15 (EU) 6.6 g VIDAL, Manuel Gonçalves; ALMEIDA, Fernando Moitinho de - "Marcas de Contrastes e Ourives Portugueses (1887 a 1993)", vol. II. Lisbon: IN-CM, nos. 4092 and 4304