1. To keep away from oil, If it is stained with oil, it should be cleaned with a professional jewelry cleaning solution. 2. To avoid bumping. 3. Stay away from radiation, the color of a diamond is likely to change when it has been irradiated. 4. Stay away from UV rays, If the diamond is exposed to strong ultraviolet light after ozone filtering, you can see small pitted spots on the surface of the diamond within a few moments