Do you have an existing bracelet you like to wear? If you do, why not have a disc from somewhere like medicalert.org.uk and add it to your favoured piece? They do sterling silver and 9ct gold, as well as the usual stainless and nickel plated stuff.
As an aside, they also appear to do an exchange/update service whereby you send back an existing tag and they replace it with one bearing the new information. They then sell your "old" metalwork, which offsets the replacement cost.
Thankfully, I don't feel the need to wear such an item, but this might be the route I would take if I did.