how does diamond glitter in light?
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because the total internal refraction
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As the light moves through the diamond, it is scattered and fractured, creating the sparkle that diamonds are known for. This is the refraction. In essence, diamonds are tiny, complicated prisms; the light enters through the top, and then is angled around the inside of the diamond before being aimed back towards the top and out through the surface. This creates a rainbow effect (dispersion), and adds to the shine. This refraction and dispersion also creates natural light and dark areas in the refracted light, depending on where the light hits along the planes of the diamond.
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