A vintage diamond single stone engagement ring set with an old European cut diamond 1.70ct and with colour and clarity assessed as J and SI2. The diamond measures approx. 7.36mm x 7.35mm x 4.89mm deep and is set in a white six claw rex setting. White leaf shaped shoulders with millegrain edge, pierced chenier supports tapering to a "D" profile yellow band 2.20mm wide. No hallmark, stamped 18ct & Plat. testing as 18ct yellow gold band with platinum setting and mount. Finger size 6.25 (US/Canada), M1.2 (UK/Australia) with some resizing possible.