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Vintage colour change sapphire solitaire ring. Set with one cushion shape old cut natural unenhanced Ceylon purple/blue colour change sapphire, purplish-blue in daylight, purple in incandescent light, in an open back claw setting, with an approximate weight of 2.80 carats, to a solitaire design, with a finely pierced collet, open backholing, the smoothly conforming shoulders flowing through to a slim D-shape shank. Tested rose gold with platinum settings, circa 1950, accompanied by Gemmological Certification Services report #79202-06.