This is a retro mid-century Japanese akoya saltwater cultured pearl tie bar.

The pearl is 7.50mm round. It has great like luster with bright rosy overtones. Good quality. 

The setting is made of solid silver. Stamped "SILVER" which is an older mark for sterling. It is high polished with a mid-century design. Total length is 2 inch. 

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