18K genuine gold filled over copper necklace . Gold filled is not to be confused with gold plated or gold only. Its a process called techno bond that expert jewelers use to bond layers & layers of real 18 K gold to the jeweler's precious or semi precious metal for durability without the expense. . Will last for many, many years with good care! 30 yrs or so. Compare with 18 k solid gold for $2999 & up. Multiple items discount available. The more you buy the more you save. Thanks for shopping with us~ Happy shopping! Enjoy!