A Large White Gem

Now, where was it?
Thorin needed it. They needed it. She needed it…
For her brother, of course. And Fíli… and Kíli. Her sons are so young, she can keep it for them. Until they are old enough.
No! What is she thinking! Arkenstone belongs to Thorin!
…
That’s stupid. Just because he is her older brother? She is a lady, she deserves better…
Wait a minute. Something strange is going on. What dark power is in play here?
…
Everybody searches for the Arkenstone.
They will bring it to them. To Thorin... and to her…
“Have you found anything yet, Bilbo?”