This is a lovely vintage black marcasite, saltwater akoya cultured pearl & sterling silver circle brooch.

The pearls measure 3.75mm. They are white in color with good luster, petite. They are surrounded by black marcasite stones, none are missing.

It is made of solid sterling silver and is stamped "STERLING". It measures 1 1/8 inches long. 

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