Add a subtle layer with a long, beaded necklace. This chic style combines a sterling silver chain with smooth onyx beads (66 ct. T.w.) and sparkling crystal accents (1.8mm x 1.3mm). Approximate length: 18 inches. 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.