couple necklace!

[itfeltvivid.livejournal.com]

craftgrrl
hey guys,
first time poster here.

i'm not sure if you would call this crafty, but i need to make a bracelet. it sounds pathetic, but i've never really made one before!
here's where i need you, crafters:
i bought this necklace for my boyfriend and i.
http://i23.photobucket.com/albums/b373/gimmicked/il_fullxfull26195919.jpg

i need to find a way to but that key on a bracelet. i was thinking something like a hemp bracelet or a friendship thing.
can you guys give me some how-to's and some tips.
any ideas or suggestions? i would like it made from material that would last longer than most. anything eco-friendly or natural would be even better!