There’s a girl that finds a pearl necklace in a box and at the end of the movie she throws the necklace in the ocean and it’s not Titanic. I also remember something about a tree. It was in English and I saw it around 2012, it was in color and I saw it on TV and I know it was a movie.
The only thing that comes into my mind is “The Secret of Moonacre”
https://www.youtube.com/watch?v=B03eKNDKJto
Hope it helps 😀