This is a classic mid-century vintage solitaire Japanese akoya saltwater cultured pearl ring.
The pearl is 7.50mm round. It has great luster with light pink overtones.
It is set in solid sterling silver with detailed prongs and a unique under gallery. It is stamped “SILVER” which is an older mark for sterling. US size 6 3/4.
All pearls are truly vintage and have only been lightly cleaned.