A group of four gold brooches

A group of four gold brooches, comprising: an oval brooch with a shell cameo of Zeus and Ganymede; an oval pendant brooch with an enamel miniature of a woman in 18th century dress with a floral crown set with rose-cut diamonds, border with enamel and half seed pearls; an enamel miniature of Raphael's 'Madonna della Seggiola' in a low-carat gold scroll frame; and a circular brooch with a painted miniature of a woman in 17th century dress, stamped 9ct