What is this item? Are they just referring to champion crowns, or is it an item players can don?

Items
NEW: The Diadem of Fire does not display correctly in darker lighting conditions.

From: Current Known Issues (2-27-2015)
https://www.ddo.com/forums/showthrea...l-Known-Issues

Sorry if this is in the wrong subforum, I wasn't sure where I could/should put it.