"How does the special fourth icon work?
Players who earn an icon in all three queues will unlock the special fourth icon based on the lowest tier achieved in the other tiers. In other words, a player who achieved Gold in all three tiers will get a special Gold icon. A player who achieved Diamond in Solo queue, Bronze in 5v5, and Diamond in 3v3 will get a special Bronze icon."
PREPARE FOR SOME HEAVY FLAUNTING.