Jon decides that focusing on threats was his first priority. If the thing was magical, and there were records about it, someone or something could be seeking it, willing to go to great lengths to get the stone.
Jon couldn't allow that to happen.
First, he needs to identify possible threats. After knowing what or whom he is protecting stone from he will be able to think of something to deal with threat. The most annoying part of the deal here was that stone had limited range. So he couldn't deal with something that was in another city, country or continent. He will need to figure out how to deal with that later.
For now he had a wish to make: "I wish I knew if someone, or some kind of being, or some group, or organization knew about the wishing stone and were actively seeking to obtain it." the stone glows brightly and Jon closes his eyes for the moment as information enters his mind...
