Solid Sterling Silver Rhodium Plated 9mm White Simulated Opal Pendant Necklace, 16" 18" 20" 24" 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 necklace is made of solid rhodium plated sterling silver and fine quality simulated opal. Our radiant simulated opal reflects back all the colors of the rainbow, easily convincing others it's the real thing. The diameter of the pendant is 9mm (0.35 in), the chain is 0.8mm thick and either 16, 18, 20, or 24 inches long. Made in-house at Beauniq Fine Jewelry in NYC.