[loramin]

It works, but you have to be careful. Ideally you should kill the quest-giver to be safe, but of course you can't always do that.

The problem is ... let's say the player before you accidentally turns in the gems but not the armor. You bring character #1 and give the NPC the armor, planning to let character #2 turn in the gems and get the reward ... but because the NPC already has the gems, when character #1 gives them the armor, the NPC gives them the reward. Now character #1 has useless armor for a different class, and you wasted your armor turn-in piece.

P.S. And the staff will not refund your items when MQ-ing is involved.