Board Thread:Roleplaying/@comment-29461586-20150127053557/@comment-32420582-20150129025322

"Either way, you lose the amulet. But one way you can go back straight away or rot in a cell for a while." Vilkas said calmly.

(I would suggest returning the amulet, the Companions already disapproved of the thieves guild and your character, now they disapprove a ton. If you returned the amulet you would get some approval with them, but if they have to drag you to jail they will disapprove even more.)