Black Onyx On Semi-Precious Oval Gemstone Ring Size 9Size 9Two graceful swirls rise up from the band to snuggle the round 8mm semi precious gemstone on this sterling silver ring. *Measurement for Center Stone is Approximately: 8mm Oval *Sterling Silver This picture is an representation of the type and quality of the gemstone you will be receiving. As you know, there are slight variations due to the natural character of this product.