A late George III enamel and diamond-set mourning ring

A late George III enamel and diamond-set mourning ring, the rectangular enamelled plaque containing plaited hair and set with rose-cut diamonds in gold, with an inscription to the reverse reading 'John Knill Esq, ob 29 March 1811 AE. 77', size M, together with a gold brooch mounted with a circular portrait miniature of a spaniel, 4.3cm wide