Vintage Geometric Textured Japanese Saltwater Akoya Cultured Pearl Brooch- Sterling Silver

This is a lovely geometric textured Japanese saltwater akoya cultured pearl brooch. It features pearls that measure 4.50-5.00mm. They have good luster with light rosy pink overtones. Some are set higher in the setting than the others. It is in solid sterling silver and is stamped "STERLING". It measures 1 3/4 inch across. From Japan, 1950's-1980's. All pearls are truly vintage and have only been lightly cleaned.