Colour change Ceylon sapphire and diamond ring. Centrally set with a cushion shape old mine natural unenhanced colour change Ceylon sapphire, blue in daylight, purple in incandescent light, in an open back claw setting with an approximate weight of 7.30 carats, flanked by two rectangular baguette cut diamonds in open back rubover settings with a combined weight of 0.44 carats, further adorned by four rectangular baguette cut diamonds in open back rubover settings with a combined weight of 0.22 carats. The total approximate diamond weight is 0.66 carats, to an impressive geometric design with curving double claws, polished edges, a linear openwork gallery and fancy open backholing, the horizontally stepped shoulders flowing to a solid D-shape shank. Marked platinum, English, circa 1930, accompanied by a Gemmological Certification Services report #78142-80.
