A collection of four rings, first half 19th century

A collection of four rings, first half 19th century, comprising: a ring set with an oval panel enamelled with a picture of a woman among roses, within a border of rose-cut diamonds, mounted in gold, size P, French import assay mark for gold; a ring set with an oval glass reverse intaglio depicting Antinous, mounted in gold, the interior inscribed 'G. Aikin', size U1/2; a ring set with half pearls around a glazed compartment of hairwork, mounted in gold, inscribed 'WD 1808', size Q, pearls untested; and a ring set with five half pearls, centring on an emerald, to foliate openwork shoulders, mounted in gold, size P1/2, pearls untested