A diamond's worth is determined by the brilliance of the stone's color and clarity. A dirty diamond will turn a yellowish color and fog up on the inside. Make sure to take the time to clean your diamonds to maintain their monetary worth, whether you plan on selling them or not.
Use denture cleanser tablets dissolved in a glass of water to make your diamonds sparkle. Just drop jewelry in the solution for 2 minutes. The gentle cleanser is designed to clean dentures without dissolving or tarnishing them. If it's good enough for grandma's teeth, it's good enough for diamonds!