From UNOde50, these earrings feature:  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. Drop earrings Silver-plated metal Post back closure Handmade Approx. 1" drop 1-year warranty Imported.