Personalized 3 Names 3 Stones Heart-Shaped Necklaces are made of hypoallergenic sterling silver metal. The metal used is lead-free, Nickel-free, and will not cause any skin issues. This jewelry is coated in a special anti-tarnish polish that preserves its luster and shines for long. Your jewelry should be stored in the original pouch provided when you are not wearing it, keep your jewelry dry and clean, and avoid any contact with liquids.