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

[Vejjiegirl]

aetherial gears dont work in PVP zones, please pass this on to friends since we cant tell people to take the gear off in actual matches.

[TiramisuMacaron]

too bad we can't tell people this in feast chat.....

[Murph]

I remember when Sneak farmed Diadem for days to max his crit/det and then realized the gear didn't work, poor guy

[ArianneMartellMateus]

It works but it seems a lot weaker than normal gear after sync. A normal accessory gives 24 Crit and 23 det, a diadem accessory gave 9 Crit 9 det 9 skill speed when synced. (only tested an accessory)

[Primm]

I'm glad I found this ... so I don't have to look for a whole diadem set for my mage with crit, det and sps ..

[SuperZay]

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.

[KusoWat]

[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.

[Enlial]

It absolutely should not be capping off all its secondaries; that would defeat the purpose of ilvl sync in pvp. The relic does this, which is questionable, but not really a huge deal by itself since it only signifies a slight advantage. The potential for that across every single gear slot would become a significant advantage.
(and i will quit this game before I grind that godawful place for pvp gear)

The screenshot is from patch 3.2 patch notes, same time feast came out so it's likely they were considering pvp implications with it. I've been told it was actually a buff though (wording is vague...) and that aetherial sync'd went from useless to just almost-useless

[SuperZay]

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

I was testing a lot of first Diadem gear in 3.1 and it always had 0 secondaries when synched. They buffed it to 9 now but it's still too low when caps are up to 49.
On a side note, I don't know why many players wear full Garo set. It's not required for mounts or anything and don't give any advantages.
Proper PvP set is a mix of PvE, PvP and crafted gear based on their secondary stats.