PSA: diadem gear does NOT work in PvP. Do not use it, the substats are nerfed.

[TiramisuMacaron]

Aetherial gear secondary stats do not work synched since 2.0, nothing new here. I submitted a couple of bug reports before which were successfully ignored, so there's nothing we can do about it.

What, they were extremely overpowered until they nerfed them at some point in 3.1x.