This AA grade oval shaped stone is 1/2 inch tall, four prong set in a unique 18 karat two tone gold mount. Bead set diamonds down either side of the band. A glittering addition to any jewelry collection, Ammolite's luminous qualities rival the famous black opal for color and fire. Each Ammolite gem is unique in brilliance, color and pattern. Korite Ammolite is available in 4 grades; AA being the highest, followed by A+, A, and standard. Most jewelry items can be fitted with the grade of your choice-just call to specify any grade other than the one shown here for pricing information. All of our Korite Ammolite Jewelry is backed by a lifetime guarantee!