I just baught that bracelet for myself as an end-of-school year gift!
My friend had it and I tried hers on (she has VERY slim wrists and it fit me perfectly - she had hers made smaller by Tiffanys). When I went to the store to purchase it, they said they can make it smaller, or order one in that is smaller. I wanted that initially, although I have pretty avg. sized wrists. The SA told me its supposed to move around your wrist and many ppl wear it w/ a watch or another bracelet. I have been wearing mine alot and now I am glad I did not get it shortened. I like how it moves around and isnt quite as snug as my please return to tiffany's heart tag bracelet. Its all personal preference though..good luck w/ whatever you decide!!