A diamond ring

A diamond ring and gold, enamel and diamond necklace, 19th century, the ring of cluster design, set with lasqué-cut diamonds, to a shank of foliate design, size O; and a gold necklace composed of gold cannetille links applied with blue enamel, centring on an oval plaque engraved with foliate engraving, applied with blue enamel and set with rose-cut diamonds, length 38cm