Two shell, pearl and hairwork mourning rings, late 18th century

Two shell, pearl and hairwork mourning rings, late 18th century, comprising: a ring of oval outline, set with a section of white shell with an arrangement of knotted hair accented with gold wire and seed pearls beneath glass, to an outer border of cushion-shaped pastes, mounted in gold, size Q1/2, front measuring 3.5 x 1.9cm; and a ring of navette-shaped outline, the central glazed compartment with a cornucopia of hairwork accented with seed pearls, to a ground of pink conch shell inscribed 'SOUVENIR', mounted in gold with engraved decoration, size N, front measuring 3.6 x 2.0cm