Made of genuine opal and 925 sterling silver. Each necklace weighs 4.3g, is engraved, and is plated with Rhodium, a metal more precious than gold, so the necklace keeps it's luster. Rhodium will not turn your skin green and is hypoallergenic. You will receive 5 necklaces including the box chains, plus 5 red and black velvet boxes per bundle.