These unique pieces of Art Deco history were created by the Coro Brand in NYC in the 1930's. They are called Duette Tremblers, each piece is a two in one fastened together in the back by a clip that can be worn as a brooch or as two separate pieces to adorn shoes, sweaters, dresses, or any article of clothing the wearer wished. Some of the designs featured a tremble effect that made the gemstones dance and sparkle in the light. These brooches are costume jewelry and do not have real gemstones an