This tiara model has a very unique appearance. Dubbed the "Wonder Woman" head piece, it has a red star in its center. It only drops off of Jed Runewatcher, a rare elite in Upper Blackrock Spire, so expect to spend plenty of time farming for this. (Especially so, as UBRS is getting the "revamp" treatment for Warlords of Draenor.)
Did you know?It didn't use to be unique. There once was Holy Diadem and Cassandra's Grace that also featured the red star. The former became unobtainable after the changes of Cataclysm went into effect, while the latter's appearance was changed sometime early in Mists of Pandaria.