This beautiful 14K Gold Filled 18" necklace features a unique charm of a boy and girl kissing. —- A 14K gold fill piece is created by wrapping an actual layer of 14K gold around a jeweler's brass core (typically 90% copper and 10% zinc). By law, that layer of gold has to be 1/20th gold by weight - meaning that if you melt a piece of jewelry down, 5% of what is in the melting pot has to be gold. Because of the materials involved you can always be sure that 14K gold fill is also a nickel free material.