From UNOde50, this necklace features:  Each UNOde50 piece is unique. Designed and manufactured at its headquarters in Madrid, all products are handcrafted in Spain. All of our jewelry is made of a special metal alloy. The pieces are then plated with silver or 18K gold. All jewelry is hypoallergenic and nickel free. Chain collar necklace Silver-plated metal Lobster clasp closure Handmade Approx. 25" long 1-year warranty Imported.