This is a lovely vintage Japanese akoya saltwater blue cultured pearl flower brooch.

The pearls are 4.50-5.00mm and are round. They have fantastic luster with rosy pink overtones and are a bright blue color with gray tones. 

It is made of solid sterling silver and is stamped "SILVER". Highly detailed flower petals with hand engraved leaves and milgrain edging. It measures 2 inches long.

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