How often do you need to get an appraisal?

[moobaby]

I currently have my ring insured under its own policy with State Farm. The original appraisal was from when we bought the ring in the year 2000. I''ve recently reset my stone into a much more expensive setting then the original. I have the receipts for the new setting, so I was wondering would it be a good idea to get a new appraisal with the new setting? Or if heaven forbid something should happen to my ring, will they be able to calculate what they need for the diamond, and just replace the setting based on my receipts? Or maybe just get a new appraisal anyways since my other one was so long ago?