Datachanger

So, I am quite happy!

After hours of grinding out Valor, I finally achieved the Test of Valor achievement.
So, I went and did the two battlegrounds. (Really, though? I didn't mind it so much, but I am sure as more people are doing this, I expect a lot of QQing from PvPers and PvEers alike.) I got up a small group to kill the Dominance Offensive Leader (FOR THE ALLIANCE!!!). And I got my socket:
Eye of the Black Prince

Now, I attached the socket and put a gem into my Kilrak, Jaws of Terror, which happened to also have my Crystallized Terror (...uh duh, lol).

I started thinking.... Is there a way to replace the Kilrak when a heroic version comes up? So I went over to The Black Prince, and I saw no such way to do so. Now I do not necessarily mind, as when I do get the heroic version, progression is over anyways.

But I am just merely questioning the possibility of either a bug or a tough decision to be made on the player (Do I really wanna socket this right now?). If it is the latter, it might be worth mentioning so somewhere in the quest or item itself.

Thank you.

TL;DR: Can the new legendary gem socket be replaceable? If not, is it a bug?