What is this??

Help me! Please!! I'm begging you.  What is this thing??



I received it today from a very dear friend as a Christmas present, and I have no idea what it is.  The string is not stretchy, so I have ruled out a bracelet.  I don't believe it to be a hair accessory.  It's too long for a zipper pull or a string you tie around your finger to remind you about something (although God knows I need one of those!) and too short to be a necklace.   

This dear friend is a project manager like me, and we both work for the same company traveling extensively, so I was thinking something travel related, but it doesn't seem like it would attach to my luggage (baggage handling would rip it off!) or even my purse or keys.  We wear name badges at the locations we trave to, but I can't really see how this would attach to them, and I'm fairly certain my laptop is not in need of decor.

Here is a second view so you get an idea of the size.  It's very pretty, with a little silver butterfly above the glass bead on the left side, so I really need to thank her for it, but would really love to thank her for the _________.  I need you to help me fill in the blank!!

The absolute only thing I can even come up with is a book marker, and she knows that neither of us has the time to read books.  

You can see my dilemma... Please help me!!