Art Deco black opal and diamond ring. Set to centre with an oval cabochon natural black opal in an open back rubover setting with an approximate weight of 2.75 carats, further decorated with thirty round eight-cut diamonds in open back grain settings with a combined approximate weight of 0.60 carats, to an impressive flank solitaire design featuring polished edges, a decorative gallery with chenier motifs, and fancy shape open backholing, leading to raised stepped shoulders, and flowing through to a solid shank. Tested platinum, circa 1920.
