Copper naturally tarnishes through the process of oxidization to create a warmer feel to the piece. To prevent this from happening, avoid touching your copper jewelry too often with your hands as the oil from your skin will speed up the process of oxidization. Additionally, putting your copper jewelry in a plastic bag when it is not being worn will slow down the process. A plastic bag is included in your purchase. Finally, to completely clean your copper jewelry & bring back its original, shiny luster, dip your copper piece into a small bowl containing a mixture of lemon juice & salt. Let jewelry sit for 30-60 seconds or until desired shine is achieved. Then rinse, dry & enjoy! This process can be safely repeated throughout the lifetime of your piece.