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The Round Brilliant Ideal Cut will provide the maximum fire and brilliance due to the positions and angles of its facets. It will reflect the most light will therefore provide the most sparkle.
Ideal cut diamonds command a slight premium due to a number of reasons. (1) the extra care and skill needed during cutting, (2) more of the rough is usually cut away, and (3) they are scarce and in high demand.
The different diamond shapes are shown below.







Aswell as referring to the quality of craftsmanship of a diamond, cut also refers to a diamond's shape.
Diamonds can be cut in many different shapes and will all handle light differently. The longer shapes tend to have a slight 'bow tie' effect. This means they have a small zone in the centre where light leaks out of the bottom of the stone. This creates a darker area in the shape of a bow tie. This is especially true for the Pear, Oval, Marquise, and Heart shapes.