EF Collection's Birthstone Bead Collection provides the perfect pop of color to your necklace layer. These natural stones, along with ten 14k gold rondelles, are strung on a coated wire for maximum durability. Finished with a 14k gold lobster clasp and extension chain. Necklace measures 16 inches long with a 2-inch extender. Stone Diameter: 3.1x2.1 mm - 3.4x3.3 mm. Pearl: 5.18 carats.