Brooch and pair of earrings

Brooch (a) and earrings (b,c) of aluminum set in elaborate gold mounts and covered with fine bright-cut engraving; brooch with six semi-circular segments surmounting circular form decorated with chevrons, above a linked chain and a small, circular, foliate motif pendant; pendant earrings, each with one horizontal and two vertical semi-circular segments surmounting small, circular, foliate motif pendant.