Adorn yourself with standout style. This pretty cocktail ring highlights an oval-cut onyx center stone (5-1/2 ct. T.w.) with rings of cubic zirconias surrounding (2-3/4 ct. T.w.). Set in sterling silver. Size 7. Almost all gemstones and blue and black diamonds have been treated to enhance their beauty and require special care. All gemstone carat weights (ct. T.w.), if mentioned, are approximate; variance may be .05 carat. Custom ring sizing is not available for this item. Ring Sizer.