Number 2 Pencil has the story on a sixth grader suspended for wearing a diamond nose stud.
It gives me flashbacks to my suburban high school, which had similarly inane dress code policies, including one banning hair dyed "unnatural colors" that was enforced on a racially disparate basis (it was potentially natural for a white girl to have red hair, but not a black girl). The justification was that dyed hair "promoted low self esteem." No consideration was apparently given to the impact on teen self esteem caused by authority figures dictating your hair color and telling you it was wrong. It now appears that they have changed that policy, although boys still may not have hair longer than the tops of their shoulders. No long haired hippies in this school district!