To keep your ring sparkling, clean it often to remove lotions, skin oil, and everyday dirt, which cloud it. You can soak the ring in warm water and mild dishwashing liquid, and scrub with a soft toothbrush, says Tracy Lantz, associate director of public relations at the Diamond Information Center. Or soak your diamond ring in equal parts ammonia and cold water for half an hour, and let it air dry. (Note: use this metod with diamonds only; ammonia can damage other stones.) Any brand-name jewelry cleaner is another good option.