We mainly concentrate on polished and darkened metals. Both of them will change its color and fade over the time you wear it. Creating its own unique look. Also, there are lots of patina solutions on the market to change the metal tones to various colors.
Most Necklaces can be easily cleaned with vinegar. Make sure your Crystal can handle the cleaning process. Calcite and a few other minerals will dissolve in vinegar.
After cleaning, I suggest wiping it off with a drop of oil to protect the metal layer.
There is a small polishing towel included as well.