Natural Royal Blue Ceylon sapphire and diamond coronet cluster ring. Set with a round old cut natural unenhanced Royal Blue Ceylon sapphire to centre in an open back claw and grain setting with an approximate weight of 2.08 carats, encircled by a single row of twelve round old cut diamonds in open back grain and cutdown settings with an approximate combined weight of 0.72 carats, to an elegant circular cluster with an ornate openwork flowing motif gallery and intricate pierced backholing, flanked by inward tapered shoulders to a solid D-shape shank. Tested platinum, English, circa 1920, accompanied by Gemresearch Swisslab (GRS) report #021866.
