Here is an Art Deco (ca. 1920's) three-dimensional, sterling silver brooch from France. (Unmarked, but with a French safety catch). The cast setting is studded with marcasites. There is a rectangular, beveled, green onyx (chrysoprase) stone, bezel-set into the center of this brooch. The emerald-green stone is quite beautiful and slightly translucent. This pin is in excellent original condition. It measures 1 7/8" long, 7/8" high, and 1/4" thick. It weighs 13.2 grams.