As it is a non-porous material, you can clean your porcelain objects with a sponge, soap and hot water. Ceramics are also very resistant to dishwashers and microwaves. When loading your dishwasher, be sure to handle the parts carefully.
In order to keep your jewellery in perfect condition, it is not recommended to wear it when you sleep, swim or exercise. The patina may fade over time, and is considered natural wear and tear. How quickly it disappears depends on how well the jewel is maintained.