Talk:Champion Mastery/@comment-28293928-20160424153827/@comment-28376588-20160504082019

"Tier 6 (Magenta Diamond) and Tier 7 (Cyan Hexagon) already appear in the files. However, they have yet to be activated."

So these are in the files of the game, but we can't unlock them.

However, you can read this article, which says that Mastery Level 6 and 7 soon hits PBE, then the live servers too:

http://boards.pbe.leagueoflegends.com/en/c/general-pbe-feedback/uAFzxTpO-testing-champ-mastery-levels-6-and-7