Copper is one of those metals that makes a bold statement when you wear it because it is usually paired with contrasting colors in beads and adornments. Some people get automatically scared off by copper for fear of the dreaded green or grey marks left on your skin, but don't worry, you are not allergic to the metal, the metal is allergic to you and reacts differently on different people.
Its an an easy fix by simply cleaning you copper in the solution suggested in the Info section on the homepage, then applying a thin layer of lacquer which then needs to be allowed to dry completely. Your copper piece will come delivered to you with an initial coat of lacquer, but that too will wear over time. Jewelry sealers can be found in local jewelry supply stores near you or on-line.