Tiffany & Co. Present For A Teenage Girl?

A girl I’ve known ever since she was born is turning 13 in a couple of weeks and I want to get her a special birthday present. She absolutely adores Tiffany & Co., so I thought what would be a better idea than to get her something she loves but least expects it?
I’m not planning on getting her something very expensive from there, mostly because I’m getting her some other presents, too.
I thought this was cute:http://www.tiffany.ca/Shopping/Item.aspx…
These earrings are nice, but earrings are kind of small and not “signature Tiffany:”http://www.tiffany.ca/Shopping/Item.aspx…
Now this is in two part. I absolutely adore the Tiffany box, so this charm would look nice:http://www.tiffany.ca/Shopping/Item.aspx…
If I put it on this:http://www.tiffany.ca/Shopping/item.aspx…
Those are my choices for now. Which one do you like the most?
Love.