it wont let me, keep saying its a quest item or something like that (and no quest that need the amulet)
You must have picked it up from the dead man in solitude. You need to finish the quest related to it. Go talk to the girl running around in solitude. After you complete the quest, the mother is supposed to take the amulet, but sometimes wont. But it wont be essential, and you can then drop it.