Nice vintage piece. I would say it is a piece of Réja Jewelry- Begun in 1939 by founder Solomon Finkelstein, Déja Costume Jewelry, Inc. is known for graceful designs and lovely enameled floral pieces. After a lawsuit instituted by DuJay, the company name was changed in 1941 to Réja. Pieces prior to 1948 were of better quality than later pieces, and production ceased in 1953. Scroll down, you'll see similar ones- Reja | Designer Notes | Emerald City Vintage Costume Jewelry