A Superb Antique Amethyst Ring 18K White Gold Art Deco Ornate Filigree Setting, Vintage circa 1920. This ring has the most exquisite white gold setting composed of 18K white gold filigree. It has a hallmark in addition to 18K which appears to be P & K Co. 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 ornate detailing. The center of the ring holds a beautiful faceted amethyst gemstone measuring about 9 x 19mm oval. The entire ring measures about 3/4 inch long by about 3/4 inch wide from side to side. Ring Size: about 8 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 excellent vintage condition.