Contemporary 2.50ct fancy yellow sapphire and diamond ring

Contemporary 2.50ct fancy yellow sapphire and diamond ring in platinum and 18kt yellow gold. Centred with an estimated 2.50ct octagonal emerald cut fancy yellow sapphire in a yellow gold rubover collet setting, flanked by two octagonal emerald cut diamonds in platinum rubover collet settings, to a graduating three stone design with smooth, polished settings, structured gallery and met to either side with raised shoulders which flow to a solid shank. Estimated total diamond weight 0.40cts. Hallmarked 18kt gold, platinum, London, convention marks.