After solving the Brother's Keeper puzzle in Raamtha's Dungeon

I collected the divine key and was then attacked, following the attack
the divine key was turned into a useless Gem and I cannot get into
either the brother's keeper area or past the divine key gate. Also I
unfortunately saved over my saved game prior to noticing the key was
changed.

Any ideas about getting into the gate? Are there any hacks to add the
key back to my saved game.

This part of turning random unequiped items into gems is a real pain.

Jim