ENAMEL BROOCH, circa 1910; of square cushion form centered by a square stepped-cut peridot surrounded by a wire twist filigree highlighted in each quadrant by green plique-a-jour enamel; 18 kt. yellow gold; signed Tiffany & Co. Note: designed by Louis Comfort Tiffany, Julia Munson, designer in charge. Cf: For similar examples see The Jewels and Enamel of Louis Comfort Tiffany by Janet Zapata page 122, figure 63.