A group of cameo and tortoiseshell piqué work jewels

A group of cameo and tortoiseshell piqué work jewels, 19th century, comprising: a singe set with an oval agate cameo depicting Cupid, cameo 2 x 1.5cm, ring size O; a brown lava cameo of Omphale length 4.9cm; a pair of lava cameo earrings carved with female figures, hook fittings, length 5.6cm; an additional pair of darker lava cameo earrings carved with women in profile, hook fittings, length 2.2cm; an oval tortoiseshell piqué work brooch depicting Bacchus, length 4.6cm, and two tortoiseshell piqué work brooches of circular outline with radiating designs in gold and silver inlay, larger diameter 4cm