Mix warm water with a few drops of mild dish soap
Soak the diamond jewelry for 15 to 20 minutes
Gently scrub with a soft toothbrush
Rinse thoroughly with clean warm water
Dry with a lint-free cloth
Repeat as needed for buildup
Avoid harsh chemicals, bleach, and abrasive cleaners
Avoid using toothpaste or baking soda
Clean over a bowl or sink with a drain stopper
Have the setting checked by a jeweler if the stone is loose