This is an retro vintage blue/gray Japanese saltwater akoya cultured pearl braided ring.

The pearl measures 8.25mm and has good luster with light pink/green overtones and are a unique blue/gray color. 

It is set in solid sterling silver. It is not stamped but solid sterling silver. US size 6.25. From the 1950's-1980's.

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