Sterling Silver Jewelry
The best way to prevent tarnishing (oxidation) when not wearing your sterling silver jewelry is to store your clean, dry pieces in a dry, airtight container and keep items separate to prevent tangling and scratching. Avoid leaving your jewelry in that bathroom, as the moisture will speed up the oxidation process. Minimize your jewelry's contact to chemicals (lotion, hairspray, bleach, perfume, etc) to best maintain its shine.
To clean your sterling silver jewelry, use mild soap and water, followed by a sterling silver polishing cloth.
For items that are not highly polished, a little toothpaste can be gently rubbed with your fingers to remove tarnish. Rinse well and follow with polishing cloth.
Gold Filled / Gold Vermeil Jewelry
To prolong the life of your jewelry, do not wear your gold filled or gold vermeil jewelry when swimming or exercising. Minimize your jewelry's contact to chemicals (lotion, hairspray, bleach, perfume, etc) to best maintain its shine. To store your gold filled / gold vermeil jewelry, wrap clean, dry jewelry in a dry, soft cloth and keep items separate to prevent tangling and scratching. To clean, mix mild soap, a drop of ammonia, and warm water. Gently swish the jewelry to clean, and then dry with a soft cloth (non-abrasive), and let it dry thoroughly.