Art Deco diamond and sapphire square target ring in platinum

Art Deco diamond and sapphire square target ring in platinum. Centrally set with a round Old European cut diamond in an octagonal collet setting, surrounded by a square cluster of rectangular callibre cut sapphires in invisible settings, further enhanced to top and bottom with a panel of round eight cut diamonds in grain settings, to a geometric target design with millegrain decoration, linear gallery and diamond set shoulders which terminate to a ribbed shank.