This is a petite trefoil three leaf Japanese akoya saltwater cultured pearl brooch.

The pearls are 6.75mm round. They have great luster with bright rosy pink overtones. White color, good quality. 

It is made of solid sterling silver. It has a three leaves with hand engraving. IT has high polished swirls to give it a mid-century look. It is stamped "SILVER" for sterling. It measures 1 1/4 inches long. From Japan 1950's-1970's. 

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