Beautiful black oval onyx cabochon surrounded by sparkling marcasite on silver. Ringis stamped .925 Thailand in a filagree design on the back. Ring is size 8 and is an east/west setting, with the stone going 7/8" across your finger. There is some mild tarnish along one side of the shank. Very good vintage condition. If you are interested in the matching pendant and earrings, please check my other listings.