I bought a pair for myself and my 21-year-old daughter.  They are just as good in quality as the CZs you get in the department stores.  These are so reasonably priced, I can afford to wear them everyday and not worry about losing them.  If I had to change anything, I would prefer them to be slightly smaller.  I think smaller CZs are more authentic looking.  The 6mm may not look proportionately appropriate for some children.