Art Deco Amethyst Cabochon Dinner Ring. This 1 inch long and lovely Jazz Age jewel, circa 1920s-30s, presents a deep royal purple, elongated cabochon oval amethyst. The enchanting gemstone is framed in platinum in consummate Art Deco style with small twinkling diamonds punctuated top and bottom by calibre rubies, and on the sides with black onyx. A decorative open work under gallery, platinum diamond-set shoulders and an engraved ring shank add the finishing touches...