Ceramic is a scratchproof material which can nevertheless be marked. To return it to its pristine look, our Manufacture or boutiques can supply you with a slightly abrasive rubber, which will allow you to carry out your own maintenance.
Cut the abrasive rubber disk in two. Rub the ceramic using the flat side, and the marks will disappear as if by magic. Clean the treated surface with a soft cloth, such as Hublot's microfibre selvyt.
Attention, this rubber is not suitable for treating gloss polished ceramic.