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I am sorry to hear about this situation. What someone in your situation may wish to do is to file a criminal complaint. This is theft - a criminal matter. The police will investigate and as part of their investigation they will ask the Principal about the identity of the alleged thief. Any "confidentiality" policy the school may have should be pierced by the police investigation.
At the same time or in the alternative, someone in your situation can file a lawsuit against JOHN DOE and then subpoena the Principal to name the thief. Again, the subpoena should pierce the school's confidentiality policy. Once the name is ***** ***** suit can be amended from against John Doe to the thief's name and the suit would go forward.
However I would strongly consider filing a criminal complaint, as this would have the authorities not only likely find out the identity, but also possibly even recover the ring faster than a civil suit.
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