644 - A diamond gold and silver brooch

A diamond gold and silver brooch Gold, fineness .800, and silver, fineness .833 Set with rose-cut diamonds and 6 old brilliant-cut diamonds weighing approximately 0.80 ct Lisbon hallmark (1887-1937) and goldsmith's mark of José Nunes Pinto Ribeiro (1923-1972) 2.5x5.5 cm 13.8 g VIDAL, Manuel Gonçalves; ALMEIDA, Fernando Moitinho de - "Marcas de Contrastes e Ourives Portugueses (1887 a 1993)", vol. II. Lisbon: IN-CM, nos. 16, 82 and 5812