This is a lovely mid-century modern Japanese akoya saltwater cultured pearl cluster brooch with beaded details.

The pearls are 5.00-6.00mm round. They have fantastic luster with sharp rosy pink overtones. 

It is made of solid sterling silver and is a retro almost atomic design. There are beaded details between the square silver wire. It is stamped "STERLING". It measures 2 inches long. From Japan 1950's-1960's. 

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