Suspicion

You are a jewel thief, and you've been invited to the mansion of someone who doesn't know that you engage in such nefarious doings. While at that mansion, you're going to try to nick as many jewels as possible, but *gadzooks* the mansion turns out to be filled with jewel thieves who are all trying to do the same thing. Can you out them publicly, while staying unknown yourself and bagging a nice collection of gems?