What is the name of the movie?

I don’t know the name of the movie or the actors who played on it or timeframe or country, I am sorry about that. The story of the movie is like this; There is a little girl who lives on a cave, in some island and her name was Sapphire and she was the daughter of a fisherman. In the cave there were some precious stones of different kind and every fisherman on the group whose name was same with the stone on the cave could return to the island. The little girl was trying to protect the stones from people who stealing them. One of the stones, with the name of the girls father got stolen and she tries to find it and return it back to the cave so her father could return to the island of fisherman. That is all I remember, it is a very vague memory of when I was 6 years old, and now I am almost 25. Almost every year I try to find it by googling it but I never succeeded. If somebody can help me I would really appreciate it.

P.S.: This movie has a very sentimental value for me since it got me through some tough times in my childhood. Thank you in advance to anyone who reads this post.