I recently purchased an engagement ring that is a .47 ct, D-color, and IF and as i was leaving the store and the saleswoman was putting the loose stone back in its pouch she dropped it. What if there were other loose stones laying around where she dropped it. Is it possible she picked the wrong one up and the wrong one will be set. I know the 4 c''s but im no professional about this stuff. If this did happen will the setter notice if its not the right stone. Do they re-examine the stone before setting it? thanks