Update:
According to the blues, we can save time by just doing the highest difficulty we can
Is there anyone who obtained their cracked titan Gem on a Sarkoreth kill that was not their first Sarkoreth kill of the week in any difficulty?
I am wondering if there is any confirmation about if it only can drop on the first kill of any difficulty so I want to know if when I first kill Sark on normal in a week I am locking out myself of a higher drop chance on heroic Sark or if each difficulty has its own independent chance to get it like with the rest of the loot.
Edit: Scooberdhoob confirmed it can drop on a kill in another difficulty.