A collection of four gold and gem-set rings, 19th century

A collection of four gold and gem-set rings, 19th century, comprising: a pink topaz and chrysoberyl ring, size M; a five-stone diamond ring, size British hallmarks for 18ct gold; a three-stone ruby ring, size K1/2, British hallmarks for 9ct gold; a three-stone turquoise ring spaced by rose-cut diamonds, size L, stamped 18CT