Art Deco brooch by prestigious maker Martin Mayer of Mainz, Germany, c1925. Beautifully designed and constructed, this two-inch bar brooch combines highly faceted onyx (agate) stones with natural coral and marcasites. The onyx and marcasites have great sparkle and the brooch glitters in the light. Marked on the reverse, 835 (silver) with the Martin Mayer hallmark. The condition is excellent with no damage. It measures 2" by 3/8"and weighs 7.5g.