Hi, this is a set of three mix-and-match necklaces and pairs of earrings in amethyst, peridot and London Blue topaz. It was a gift. Set in 14k yellow gold, the necklaces can fasten at 16 or 18 inches. However, it seems the jeweler messed up the lengths because they vary from 15.5 to 18.5 and the lengths on each are different, which is great for layering.