This is a retro vintage solid yellow gold & Japanese akoya saltwater cultured pearl bypass ring. 

The pearl is 7.50mm round. It has good luster and is a very white color. It is in a bypass setting with crosshatch texturing.

It is in solid 14K yellow gold but is not stamped.  US size 8. From mid-century. 

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