You can try to use mild cleaning agents, such as detergent and toothpaste, and clean with a soft brush. This can remove the pigment from the diamond and the ring holder, and brush off some dirt in the gap of the ring holder.

Or dilute the detergent with warm water at home and soak the diamond ring for a few minutes. This detergent can effectively remove oil stains. Buy a soft brush to clean the diamond, then dry it with a towel to make it look brand-new.

If the above methods fail to clean the hand-painted pigments successfully, it is recommended that you go to the jewelry store to use professional instruments for professional help. Diamond ring belongs to valuables, so try not to rub against hard objects, which will cause wear and tear on gems.