While ammonia can be used to clean some types of jewelry, it is not suitable for all materials. Ammonia is a corrosive substance and can damage certain metals, gemstones, and pearls. In general, it is best to avoid using ammonia when cleaning jewelry unless you are confident that it will not cause any harm.

The following types of jewelry should not be cleaned with ammonia:

* Gold: Ammonia can react with the copper in gold alloys, causing them to tarnish or develop a dull finish.

* Silver: Ammonia can dissolve the silver sulfide layer that forms on silver, leaving it looking dull and discolored.

* Pearls: Ammonia can damage the nacre of pearls, causing them to become weak and brittle.

* Gemstones: Ammonia can damage certain gemstones, especially those that are porous or sensitive to acid. Some gemstones that should not be cleaned with ammonia include opal, turquoise, lapis lazuli, and malachite.

If you are unsure whether or not ammonia is safe to use on your jewelry, it is best to consult with a professional jeweler.

Here are some alternative methods for cleaning jewelry:

* Mild dish soap: Dish soap is a gentle and effective way to clean most types of jewelry. Simply add a few drops of dish soap to a bowl of warm water and soak your jewelry for a few minutes. Then, gently brush the jewelry with a soft toothbrush and rinse it thoroughly with clean water.

* Baking soda: Baking soda is a natural cleaner that can be used to remove dirt and tarnish from jewelry. To use baking soda, make a paste by mixing it with a little water. Then, apply the paste to your jewelry and rub it gently with a soft cloth. Rinse the jewelry thoroughly with clean water.

* Vinegar: Vinegar is a mild acid that can be used to dissolve dirt and tarnish from jewelry. To use vinegar, soak your jewelry in a solution of equal parts vinegar and water for a few minutes. Then, gently brush the jewelry with a soft toothbrush and rinse it thoroughly with clean water.