ABOUT OUR METALS All metals used in our jewelry are produced in the USA and are nickel free. Our jewelry is made from natural metal that is not plated or sealed. These metals will naturally darken, especially copper and brass giving them a more rustic look. This is totally normal for these metals and is not a defect. If rustic is not your style they can easily be cleaned with the included polishing/cleaning cloth which shines them up like new!