Make at Home Jewelry Cleaner For Silver and Gemstone Jewelry: 

This recipe is from wire-sculpture.com.  This saves money and is safe for you and the environment. 
  1. Heat water in the microwave for 1 or 2 minutes.
  1. Cut a piece of aluminum foil that roughly covers the bottom of a small bowl (like a cereal bowl).
  1. Pour hot water into bowl. Place salt, soda, and dishwashing liquid into bowl. Place jewelry on top of foil and let it sit for 5 to 10 minutes. Rinse jewelry in cool water and dry jewelry completely with soft cloth. Discard solution after use and make a new batch next time.
  1. According to wire-sculpture.com, "this works well for gold-filled, brass, german (nickel) silver, and sterling silver. I have even cleaned jewelry with freshwater pearls, shell cameos and mother of pearl with no problem.". www.hummingbirdjewelry1.etsy.com