Many gems, and particularly diamonds, attract dust, soap film, and even oil from your skin. Some of these substances are easily removed with a soft brush and a mild solution of soapy water or diluted ammonia. However, cleaning must be done with caution. Many gem materials, particularly organics such as amber, ivory, coral, and pearls, can be damaged by ammonia. Ask your jeweler about methods you can safely use to clean jewelry yourself, and at the same time discuss having your jewelry professionally polished and cleaned periodically. Ultimately, your jeweler’s training and experience provide for the safest and most effective cleaning of your jewelry.