Apparently people are exploiting the rollback system now. : Diablo
Its allready all over everywhere anyways, but FYI if you diddn't know, you can roll back your rolled back items to get back super high level exploited gems. Read through the above link and do some google-fu if you're not sure what im talking about.
TLR version for the lazy? Blizzard screwed up the recent patch. there was an exploit that let you get crazy high gems. they hotfixed and rolled back the gems. someone figured out you could use the blizzard rollback feature (im guessing like item restoration on wow?) to get there high level gems back.
Wouldnt suggest doing it though, blizz seems to be on to them, seems super ban-worthy.