1cm is pretty big for a stone, but just small enough to work it's way out of the kidney and start fucking shit up. You got fucked. If they stay in your kidneys they can shatter it with ultrasound. It's a comparatively fantastic experience. I've either passed mine on my own or gone through the procedure I just mentioned.
I take it they're going up to get it? Doesn't sound fun.
I don't believe in belts. There should be no ranking system for toughness.