Solid Sterling Silver Rhodium Plated Blue Inlay Simulated Opal Diving Dolphin 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 necklace is made of solid rhodium plated sterling silver, featuring fine quality simulated opal. Our radiant simulated opal reflects back all the colors of the rainbow, easily convincing others it's the real thing. Necklace comes in16in, 18in, 20in, 24in lengths or as just a pendant. Pendant measures 23mm (0.91 in) x 12mm (0.47 in).