Four 19th century amethyst-set gold brooches

Four 19th century amethyst-set gold brooches, including an oval-shaped amethyst brooch, set in gold cannetille surround, 4cm wide, a closed-back gold brooch set with seven graduated amethysts in closed-back mount with cannetille and shell surround, 5cm wide, an amethyst, seed pearl and gold pendant, 3.8cm wide and a large amethyst and gold brooch, 5.5cm wide