An Art Deco diamond, ruby and onyx ring, the pierced domed tapered ring centred with a collet set old brilliant-cut diamond, to the centre of a tapering cross of graduated old brilliants, further accented with channel set baguette-cut onyx and fancy-cut rubies, (rubies untested for natural versus synthetic origin), mounted in white precious metal, later replaced shank, principal diamond approximately 0.45 carats, ring size M. £1200-1400