This is not a movie for kids or even teenagers. It vulgar and appalling in many ways, but the reason it is so good is because it is an unapologetic, truthful essay on human nature, desire and flaws. The title is not about precious gems, it is about the characters, each of which have at least one redeeming quality and one incredible weakness. It is highly symbolic and many will be able to relate to it. Very thought provoking. Its hard to recommend because of some of the scenes that are just shocking and inappropriate, but its portrayal of true human nature makes it very strong.