1950s ruby and diamond 'toi et moi' engagement ring

1950s ruby and diamond 'toi et moi' engagement ring in platinum and 18kt yellow gold. Set with an estimated 0.90ct round Old European cut diamond in a raised platinum claw setting, adjacently set with a cushion shape mixed cut ruby in a raised claw setting, to a two stone design with curving claws, intricately pierced collets and swirling diamond set shoulders which terminate to a solid shank.