Vintage 2.80ct no heat sapphire and diamond three stone ring

Vintage 2.80ct no heat sapphire and diamond three stone ring in platinum. Centred with an estimated 2.80ct oval mixed cut sapphire with no indication of heat treatment in a raised four claw setting, flanked to either side with two round old European cut diamonds in four claw settings, to a graduating three stone design with curving claws, structured openwork gallery and flanked to either side with raised inwardly tapering shoulders supported by decorative cheniers which continue to a solid shank. Estimated total diamond weight 1.60cts. Marked platinum.