Copper Earrings, Circular, Green Patina Handmade by skilled artisans in Michoacn, Mexico. 100% Recycled Copper Hypoallergenic, Nickel-free hooks Color: Green Patina. The face of the earring is painted with an acid that causes the copper to oxidize which brings out this wonderful and unique color. Each item is mounted on a kraft hang tag/information card, wrapped in tissue paper, and packaged in a mini burlap gift bag.