Two Georgian paste cameo rings, second half 18th century

Two Georgian paste cameo rings, second half 18th century, comprising: a ring of marquise-shaped outline, set with a paste cameo portrait of a young boy in profile, possibly a young Prince Ernest Augustus, Duke of Cumberland, later King of Hanover (1771-1851), on a red foiled ground, behind glass, mounted in gold, front measuring 3.5 x 1.9cm, size R1/2, cameo signed BROWN; and a ring of oval outline, depicting the soldier and politician Sir Eyre Coote (1726-1783), recorded in the William Tassie archives, no. 14166, in a coat and sash, on a black ground, behind glass, mounted in gold, front measuring 3.1 x 2.4cm, size U