With wear and exposure to the elements, copper jewelry develops a natural patina that is unique to the piece.
Some wearers prefer this natural wear, however, others prefer to pertain the natural shine. There are many ways to polish copper jewelry. Using fine steel wool or a polishing cloth works well, but one could also use many other household items such as lemon juice or baking soda applied to the surface.
With all of your pieces, take care not to bend or twist. Remove when swimming or bathing and keep sealed in an airtight container.
Many choose to keep the copper unsealed to benefit from its varied therapeutic effects, and most pieces can be sealed by request.