A collection of carved hardstone jewellery

A collection of carved hardstone jewellery, including an agate cameo pendant, depicting the profile of Apollo Belvedere, with a circular-cut diamond and with a circular-cut diamond mounted to the reverse, pendant loop, 4cm high, together with a 19th century intaglio-mounted gold brooch, depicting Venus Marina, set within a surround of seed pearls, glazed compartment to the reverse containing hair, the cameo 2.8cm high and a hardstone cameo brooch pendant depicting the Virgin and Child within a seed pearl-set gold surround, 4.1cm high, cased