Four antique gem set rings

细节
Four antique gem set rings
comprising: an amethyst and hairwork oval head ring with wave shank white enamelled James Robinson. Ob. 23 May 1768. Aet 33; an oval foiled garnet single stone; a foiled garnet single stone with rose-cut diamond two stone shoulders; and an 18ct. gold, onyx, half pearl and black enamel, London 1845. (4)