For the wedding necklace one....sis, she's not a real friend. She's being an entitled brat, and a REAL friend would not care and be happy for you, even at THEIR WEDDING. Also I'm pretty sure what your "friend" did to your hair in the last story....that IS ASSAULT. Do NOT drop the charges.
For the last one I think you keep the charges and sue him cause that is what I would do and I would be very mad and that is not fair to do to other people