Sterling Silver Rhodium Plated Simulated Birthstone and CZ 9mm Cushion Cut Halo Pendant Necklace Unsure what length chain to buy? 18 inches is the standard length and will look great on most people. To purchase the pendant by itself (without a chain), choose the "0.0 inches" length This pendant and necklace are made of solid rhodium plated sterling silver, featuring quality simulated ruby and cubic zirconia stones. Our simulated ruby has a rich, beautiful color and an unmatched sparkle, so it will easily convince others it's the real thing. The necklace is a strong, luxurious-looking cable chain with a spring ring clasp. The pendant measures 9mm (0.35 in) x 9mm (0.35 in) and weighs 1.2g. The chain measures 1.3mm thick and weighs approximately 1.7g. The necklace comes in 16in, 18in, 20in and 24in lengths.