Diamonds are cut in certain ways to allow light to pass through the top, reflect internally, and pass through the top again. The diamond can reflect light internally because the light is moving from a high index of refraction to a low index of refraction. For the light to reflect internally the light has to be at an angle greater than the critical angle of the diamond. If the light is at an angle that is less than the critical angle the light will pass through the bottom, resulting in a badly cut diamond.
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