A cut diamond sparkles because of _________ .

hardness

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emission of light by the diamond

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high refractive index

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absorption of light

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Solution

The correct option is C high refractive index
Diamond has a very high refractive index. Because of this, its critical angle is very small. This leads to the total internal reflection of most of the light inside the medium. Also, the diamond faces are carefully cut. This leads to light coming from different faces. This is the reason diamond sparkles.

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A cut diamond sparkles because of its ___ .

A cut piece of diamond appears to sparkle much more than an identically cut piece of glass. Why?

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