As the picture explains, it's about a girl who gets a magic wishing crystal who grants her wishes. I mean come on... who wouldn't want that? And back when I read this, I was... Oh I dunno, 10, maybe? And the thought of having a wishing crystal was probably a dream come true.
I remember I read this book a few times, and it made me sort of melancholic knowing that I've had this book for YEARS (I'm 25 this year) and that it's one of the first books I really loved.
I have also attached 2 pictures of how my copy looks like now:
