A Superb Antique Rise de France Amethyst and Diamond Ring 18K White Gold Art Deco Floral Filigree Setting, Vintage circa 1920. This ring has the most exquisite white gold setting composed of 18K white gold. It has a hallmark in addition to 18K which appears to be a B and a backwards R. The work is equivalent to that of Ostby and Barton and Belais, two of the top quality jewelers of the period. The setting has filigree openings with floral detailing going all the way around the ring. The center of the ring holds a beautiful faceted rose de France amethyst gemstone measuring about 11 x 13mm. The very center is set with an antique diamond. The entire ring measures about 9/16 inch long by about 3/4 inch wide from side to side. Ring Size: about 7 1/2(could be resized by your jeweler or ask me about using mine before shipping). This ring dates to the late Victorian to Art Deco period, circa 1920 and is in lovely vintage condition.