Upscale appeal. This necklace, crafted from 14k rose gold over sterling silver, makes garnet (12 ct. T. W. A star that's truly stunning. Approximate length: 36 inches. Total dimensions:. All gemstone carat weights (ct. T. W. If mentioned, are approximate; variance may be. 05 carat. Almost all gemstones have been treated to enhance their beauty and require special care.