I am buying a piece of jewelry for each bridesmaid as part of their gift, though they'll each be slightly different, since they each have their own styles and preferences. I don't expect them to wear it for the wedding (unless they want to). They can pick what jewelry they want to wear for the wedding.
I bought a necklace for them as part of their gift, but I'm not liking the look of it anymore lol, so I'll most likely re-gift them and find another necklace I like better. I'm letting them wear their own earrings (studs), and they don't want to wear a bracelet.
Since everyone is picking their own dresses (not like "pick one of these 5 styles from this particular line of BM dresses"....like "please find any dress within a few parameters and show up in it"), I bought everyone matching earrings to make them stand out as bridesmaids/tie the look together!
Thank you everyone for your input. I decided to tell them to choice their own jewelry but to keep it simple and remember that belt on their dress was pearl and crystal. They all have matching dresses and shoes so this will let them be them a little bit.