This week's Monday tip is brought to you by the letter H for Hydrogen Peroxide.
Simply fill a small glass or bowl with enough hydrogen peroxide to cover the jewelery you want to clean. Let it do it's thing (bubbling action) for a few hrs. If you have an old soft toothbrush, give it a little scrub at the end. Rinse with water, and you'll have gorgeous sparkling and gunk free jewelery for about $.04.
I've done this with silver and white gold and have never had issues, but if you're worried, consult your warranty policy that comes with fancier pieces!