All platinum Art Deco three stone diamond bridge ring box set early round brilliant cut diamonds approx 0.31ct, 0.256ct, 0,275ct on fancy scroll pierced gallery, marked S D & Co. (Stewart Dawson & Co.). Stewart Dawson founded in circa 1886 Stewart Dawson and Co. in Sydney with branches in Melbourne, Auckland and Dunedin in New Zealand and Regent Street in London., ring size N 1/2