Stolen wedding ring, chances of winning in court?

Someone close to me had her wedding ring stolen and is positive that she knows who took it. She filed a police report, talked to the pawn shops, etc. The police told her that she could press charges against the person she suspects even if she never retrieves the ring.

Can you actually win a case by just saying something to the effect of “I saw this person rifling through my jewelry box the day before the item went missing…” ?

Is it even worth going to court over? (Not that I don’t think she should, because if it were me and I had any chance at all to win, I’d take it to court on principal alone.) What are the odds that she would win?