A group of three rings

A group of three rings, comprising: one mourning ring set with a banded onyx, to a gold mount enhanced with black enamel and rose-cut diamonds, the interior with a dedicatory inscription dated 1888, size L; a ring centring on a half pearl between cushion-shaped diamonds, within geometric borders applied with black enamel and accented with rose-cut diamonds, size O; and a ring set with an oval emerald between trios of brilliant-cut diamonds, mounted in gold, size Q, British hallmarks for 18ct gold