A mid 19th century painted ivory portrait miniature, enamel, seed pearl and diamond swag necklace

A mid 19th century painted ivory portrait miniature, enamel, seed pearl and diamond swag necklace
Set to the front with a painted portrait of a lady within a rose-cut diamond and enamel surround, capped by a diamond-set crown, to three articulated connector chains of enamel, seed pearl and diamond detail, to two heart shaped similarly-set portrait miniatures and further two connector swag chains and a diamond and enamel set oval clasp, circa 1850, 42.8cm long