This substantial, handmade brooch was made in the Brutalist style circa 1960, with an iridescent fire agate set in sterling silver with a hammered, textured reverse.  Very chic and sculptural, I've worn this brooch in the store and have always received compliments!  In addition to the pin back, there is also a bail attached so you can wear it as a pendant.  This piece is not signed, but it should be--it is so stylish!

Measures 2.25 x 1.5".  Not stamped or signed but acid-tested for metal content.  Weighs 27.5 grams.