Cut, too, has a tremendous impact on fire. The facets of the stone reflect the light traveling through the stone. If the angles and proportions are just right, most of the light that enters the stone gets broken apart into the colors of the rainbow and reflected back out through the top of the stone, giving tremendous fire. If the angles or proportion of the stone are a bit off, then some of the light is allowed to escape through the bottom and sides of the stone, reducing the stone's brilliance. This lack of precision in the cut is not always an accident.
Some cutters purposely facet a stone imperfectly, to maximize the weight of the finished stone.
Different shapes also affect the stone's fire. The cut with the greatest fire is called the brilliant cut. This is the perfect cut for diamond, and it comes in many variations, so you are certain to find one that is right for you. The choice among the others depends largely on your budget. This is the weight of the stone, the larger the stone the more it will weigh.