I would say no initials or butterfly's. I wore both when I was in middle school, and even then only 6th grade. Hearts don't just have to be from bf's. I know a ton of people who got there tiffany "return to" hearts from parents/grandparents ect. Another big thing are keys, I am loving them at the moment and a lot of people have been wearing them.
I know you said you want real, but do you have a particular place you would be looking. I could go on the website and pick out some parent appropriote necklace (something I would like to get from my mom/dad).