My ex bought me a gorgeous platinum and diamond star pendant from Tiffany.
http://www.tiffany.com/Shopping/Ite...-p+25-c+287465-r+101323351-x+-n+6-ri+-ni+0-t+
It's the smallest one - very delicate - very feminine. I just love it, and wear it still. I don't think it's too young at all. The larger ones might be a bit showy for me though.