Two diamond half-hoop rings, Early 19th Century (2)

Two diamond half-hoop rings, Early 19th Century
1st: Set to the front with a graduated row of cushion-shaped diamonds in closed-back settings, mounted in silver and gold, 2nd: Set to the front with two rows of cushion-shaped diamonds in closed-back settings, mounted in silver and gold, 1st: two diamonds deficient, 2nd: one diamond deficient, 1st: ring size L½, 2nd: ring size Q½ (2)