A late 19th / early 20th century diamond and pearl brooch, centred with a round white pearl,

A late 19th / early 20th century diamond and pearl brooch, centred with a round white pearl, within a double border of old round-cut diamonds, within a stylised border of old round-cut diamonds, brooch approximately 4.5 cm diameter, yellow and white metal mount unmarked, eight largest diamonds approximately 3 mm diameter, 17.5 grams.