Thorin vows to kill anyone who withholds the Arkenstone .
He had possession of the Arkenstone.
Bilbo never intended to keep the Arkenstone. He only took it because he saw the feverish greed that overtook the Dwarves when the saw their long lost treasure. Knowing how badly Thorin coveted the Arkenstone, Bilbo kept it and later used it to bargain for his share of the treasure (which he intended to share with Bard and Thranduil). What it revealed was that deep at heart, Bilbo was a good person and only wanted to do what was right. It was why Gandalf was drawn to him in the first place.
thorins is much powerfull
Bard told Thorin that Thorin must give Bard a portion of the treasure to rebuild Esgaroth, or he would be considered the foe of the lake-town.
Bard keeps the arkenstone and will give it back to Thorin later if he can receive part of the share
Smaug has the Arkenstone in his hoard. Bilbo acquires it from the pile of treasure. He then gives it to Bard. Bard puts it with Thorin when he is buried. That is where it stayed.
When Thorin was entombed in the Lonely Mountain, Bard laid the Arkenstone upon his breast.
Bard prevented them from entering until the exchange for the Arkenstone had been made.Because they are there to help Thorin. Bard knows it will be easier get Thorin to accept his demands if he is isolated from any help.
Bilbo snuck out of the Dwarves camp and delivered the Arkenstone to Bard.
Bilbo found the Arkenstone in Smaug's treasure chamber.
Thorin vows to kill anyone who withholds the Arkenstone .
Spoiler Alert! Thorin is laid to rest under the Lonely Mountain with the Arkenstone on his breast.
Bard wanted to wait until the gold and silver had been brought out in exchange for the Arkenstone, he was afraid that there wouldn't be any chance once Dain had joined Thorin in the mountain.
He had possession of the Arkenstone.
Bilbo never intended to keep the Arkenstone. He only took it because he saw the feverish greed that overtook the Dwarves when the saw their long lost treasure. Knowing how badly Thorin coveted the Arkenstone, Bilbo kept it and later used it to bargain for his share of the treasure (which he intended to share with Bard and Thranduil). What it revealed was that deep at heart, Bilbo was a good person and only wanted to do what was right. It was why Gandalf was drawn to him in the first place.
He forgives Bilbo for stealing the Arkenstone, and then tells Bilbo that everyone should be like the hobbits: more concerned with comfort than with treasure. Then Thorin dies. He is buried with the Arkenstone, and Dain, Thorin's cousin, is proclaimed the new king.