Louisa (d. 1736), second daughter of John Carteret, Earl Granville by his first wife, Frances, daughter of Sir Robert Worseley, 4th Bart., married Thomas, 2nd Viscount Weymouth in 1733 as his second wife.
A very similar enamel is illustrated in S. Coffin/B. Hofstetter, The Gilbert Collection. Portrait Miniatures in Enamel, London, 2000, p. 123, no. 77.