This is a lovely vintage floral marcasite and Japanese akoya saltwater cultured pearl brooch.  

The pearl measures 7.50mm and has great luster with bright rosy overtones.

It is made of solid sterling silver and has a unique design. Very detailed with marcasites throughout. (None are missing). It measures 1 5/8 inches long. Stamped "925". 

All pearls are truly vintage and have only been lightly cleaned.