Each Elizabeth Costigan jewelry piece is handcrafted and colored with a unique patina. Patinas are organic and uncontrolled - your piece may have slightly different color than what appears in photo. Montana artist, Elizabeth Costigan celebrates the Patina process. Patinas are the natural oxidation of copper, achieved by many different methods and recipes. The EiC method is a natural, mineral based process. Materials are as consciously sourced as possible.