A ring 500/1000 platinum and 800/1000 gold set with a round-cut emerald weighing approximately 3.90 ct., 10 trapezoid-cut diamonds weighing approximately 1.90 ct., and 10 navette-cut diamonds weighing approximately 1.20 ct. Portuguese emerald with traces of treatment Lisbon mark (1938-1984), maker's mark by Fernando da Silva (reg. 1968) Dimensões (altura x comprimento x largura) - 18 (18,5 mm) cm; Peso - 11,2 g. Notes: vd. VIDAL, Manuel Gonçalves; ALMEIDA, Fernando Moitinho de - "Marcas de Contrastes e Ourives Portugueses (1887 a 1993)", vol. II. Lisbon: IN-CM, nº 94, 109 and 4213.