Sapphire cocktail ring. Set with fifteen round old cut natural unenhanced sapphires in open back claw settings with a combined approximate weight of 2.50 carats, to a bombé shaped cluster with a double ropework border to the central bezel and intricate pierced backholing, enhanced with circular gold highlights to top and bottom, and flanked by smoothly integrated broad rounded shoulders which taper through to a D-shape shank. Marked yellow gold, maker's mark 'C F', French control mark, circa 1940.
