I like the larger stone/crystal.  The smaller one is virtually useless as it will not be noticeable and it also may fall into the hole in the nose.

I had a hard time finding a nose jewelry with a long enough stem this one said it was around 7mm and it right.  It JUST the right length, wish it were a little longer still however.

Reason for only 3 starts is because the smaller 2mm stone jeweler is wasteful because I cant use it, yet I paid for it.