Well, there are a couple of other ways to look at this. Maybe the other parent went through the principal because they weren't sure how YOU would react, or maybe it was because they didn't have a way to get your contact info. I can see how someone might think that going through the principal was a way to keep things under control.
You don't give much detail, but you do say that your son broke the necklace. Whether it was an accident or not, I think you should pay (and you said so yourself). If I get in a car wreck it is still an accident, but if it is my fault I have to pay.
As for wearing jewelry, I think someone should be able to wear it and not worry that another person will break it regardless of their age.
I think you are giving the whole issue more importance than you should. I do this on occasion and my DH gently reminds me to let it go because the anger/stress just takes time off of my life.
You don't give much detail, but you do say that your son broke the necklace. Whether it was an accident or not, I think you should pay (and you said so yourself). If I get in a car wreck it is still an accident, but if it is my fault I have to pay.
As for wearing jewelry, I think someone should be able to wear it and not worry that another person will break it regardless of their age.
I think you are giving the whole issue more importance than you should. I do this on occasion and my DH gently reminds me to let it go because the anger/stress just takes time off of my life.