I scratched my grandmother's antique chinaware
That is not good, did you apologize for it?
No, I'm hoping she won't notice it at all.
That was not right for you to play around with something that doesn't belong to you. You should let your grandmother know what happened. Telling the truth to someone would make things better between you.
What? I can't deal with getting in trouble with my grandmother. She would be upset.
It's still better than hiding it. She will be even more upset if you pretend you didn't do it.