Or just put up a Craigslist thing: Found, one bracelet, near this place. E-mail to (custom address for this purpose).
Let the person describe the bracelet so some random schmuck doesn't just go, "Yeah, I totes lost that, uhh... bracelet? Yeah. It was mine."
Less effort and expense on your part. If you really want to be thorough, you could put up a few posters with similar info, I guess. I'd still make up an e-mail address for that purpose, though.