So sorry haven't figured out how to upload a picture yet...
I had the same problem.
This post helped me

http://forum.purseblog.com/feedback-dropbox/posting-photos-25.html
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So sorry haven't figured out how to upload a picture yet...
It's a silver DBY chain actually, one of the older thicker ones they used to make. It's 30 inches, and I love wearing the key on the longer chain! The 30in platinum DBY chains are ridiculously expensive ='( I also had Tiffanys put a loop at 24 inches so that I can wear the key at 24 inches. In the photo it is clasped at 24 inches.
This silver chain was a set with the silver large open heart pendant.