Me personally I chose small earrings for my daughter and did not let her wear necklaces, since the latter can be caught by a hook or anything protruding. When she was smaller she was ok with my choice, she never questioned it. When she came older, 11-12 years old, we talked about what is a practical size for school or for an occasion. What colors fits to her or her face shape.
Be sure that the earrings you chose do not contains nickel. I have a good experience with gold jewelries when they are small, and later from teenage they can have other metals, too.
That is always an issue. She is always in a hurry so I always seek earrings or necklaces with a handy or a magnet clasp. She gets annoyed with earrings that is difficult to put in.
Surely let the child be responsible for her jewelries. I bought for my daughter a beautiful jewelry box. She keeps order in it and often cleans it. However, I would surely keep diamond or expensive pieces in a home safe.
Now that she is older she trends to wear bigger pieces than before (my designer earrings), but again, she says that big earrings are heavy and are not practical in winter time. We also take into consideration her face (she has a small and oval face) and height. Huge things definitely look comic on her.
I let my child use my designer earrings on some occasions, but for everyday life she prefers small earrings or thin necklaces.
Honestly saying – Thank God – this is not an issue for us. I know many kids are crazy about piercing or tattoos. I have no experience with this, but I know many parents are facing hard times when a child is coming home with such a request. I think, again, it depends on the child and surely would keep gradualism. I would suggest to my daughter to have it in a hidden place first to have the experience, so if she changes her mind later not to have it, it would not be visible. I would also highlight the importance of cleaning.
I mentioned this in the previous topics. It depends on the age of the child or the child’s behavior.
Recently it became common to use amber necklaces as an alternative health protection against tooth pain or respiratory diseases. Some people say it works. However I read article about small children died of being choked.