"Cut" refers to the specific proportions of a diamond, and has an enormous impact on its beauty, and therefore its value. The brilliance of a diamond rests upon the way light reflects and refracts from the gem to the eye. When light enters a diamond, proper faceting causes that light to bounce around and ultimately find a path back out through the top of the diamond. Every movement makes the light dance and the prism-like effect creates a rainbow of colors that flash from the diamond.

The more properly proportioned the diamond, the greater will be the percentage of light entering the diamond that will reflect back through the top to your eye. When a diamond is cut too shallow, or too deep, or without correct symmetry, some light entering the stone will spill out of the sides or be lost through the bottom of the stone, thereby reducing the diamond's brilliance and beauty.

This precise cutting can actually make a smaller diamond more expensive than a larger one which is not cut to proper proportions. The extra care taken in cutting means you will have a diamond that is more beautiful... and more valuable.
Do you want to know more...(see a diagram of a diamond)

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