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Black, Starr & Frost antique sapphire and diamond three stone ring. Centrally set with a round old cut natural unenhanced sapphire in an open back rubover gypsy setting with an approximate weight of 1.10 carat, flanked by two round old cut diamonds in open back rubover gypsy settings with an approximate combined weight of 0.80 carats, to a bold three stone design featuring polished edges, a conforming gallery and circular open backholing, flanked by smoothly tapering shoulders, flowing down to a solid D-shape shank. Tested 18 carat yellow gold, maker's mark 'B.S & F.' for Black, Starr & Frost, American, circa 1900, accompanied by Gemmological Certification Services report #79187-28.