As the title says I'm unable to retrieve the amulet fragment of Gauldurs amulet in Gerimund's Hall. This most likely is the result of me clearing the dungeon without the quest a couple of hours ago and perhaps not picking up the quest item back then. Anyway, the waypoint leads me to a place in the shallow water of the bossfight chamber and indicates something to pick up but it isn't there.
Can anyone please help me and tell me how I can solve this problem? Thanks.