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

The pearls measure 3.50mm and are very petite. They are a cream color with good luster and light pink overtones.

It is made of solid sterling silver and has a unique design. The flowers are attached via a rivet design and move very slightly. Very many marcasites throughout (none are missing) and milgrain edges. It measures 2 1/2 inches long. Stamped "LSLP" for an unknown designer and "STERLING SILVER". 

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