We've heard all of the old wives' tales when it comes to at-home remedies for cleaning jewelry--toothpaste supposedly shines your diamonds, ketchup helps polish silver, and a bit of beer will enhance gold's luster. Knowing what actually works and what doesn't is a trial and error process we'd rather avoid, which is why we've asked jewelry designer and 2013 CFDA Award nominee Irene Neuwirth for her expert advice on the matter. .