The movie "Eragon" 2006

When Eragon (Edward Speleers), a poor farmer's boy, discovers a beautifully polished blue stone in the forest, his joy knows no bounds. His first thought is that he will be able to buy food for his family for the whole winter. But the stone turns out to be a dragon egg. It hatches into Saphira, a female dragon magically bound to Eragon, and he becomes the heir to a mysterious destiny. Soon he is caught up in an adventure he could not have imagined just a few days earlier.