A ring 800/1000 white gold set with an emerald-cut diamond weighing approximately 1.17 ct., colour grade I~J, clarity VVS and strong fluorescence Portuguese signs of use Porto mark (1985-2020), maker's mark of António de Jesus Ribeiro (reg. 1960) Dimensões (altura x comprimento x largura) - 12 (16,5 mm) cm; Peso - 4,4 g. Notes: vd. VIDAL, Manuel Gonçalves; ALMEIDA, Fernando Moitinho de - "Marcas de Contrastes e Ourives Portugueses (1887 a 1993)", vol. II. Lisbon: IN-CM, 1996, Nos. 4101, 4129 and 4460.