Three early 19th century diamond rings and a brooch

Three early 19th century diamond rings and a brooch
The first ring set with old brilliant and single-cut diamonds; the second set to the front with two rows of similarly cut diamonds; the third set to the front with an openwork panel of diamonds and garnets, finger sizes K1/2, L and M respectively; the openwork giardinetto brooch set with foiled closed-back rose-cut diamonds (4)