Just finished the dungeon for the ruby dragon's claw but I still can't get rid of the thing! Can't drop it or sell it. Did I miss something? Do I have to give it to someone like the golden one? Or is this just a glitch?

Nobody?

Its stuck in my inventory also, not that big of a deal it only weighs 0.5

Drop everything in your inventory but quest items then look back at your weight. Then whine some more when you realize the sad, sad truth.