Dark and dynamic. B. Brilliant's stud earrings feature round-cut black cubic zirconia (2 ct. t.w.) for a stylish touch. Set in sterling silver. Approximate diameter: 1/4 inch. 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.