At least they guarantee it, and will fix it, if a stone falls out. I haven't had to do the process yet, but read other posts on going through the process. Someone got a credit when there was a situation that couldn't be repaired.
I do have one stone that looks junkier though. It did make me wonder if they bought other CZ and just labeled it Diamonique. The stamp said China so maybe some are cheaper and they are losing those customers that try those by chance?