Question

why do diamonds sparkle??
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Answer 1

Answer:

Light cannot easily escape a diamond, because its critical angle with air is so small. Most reflections are total, and the facets are placed so that light can exit only in particular ways thus concentrating the light and making the diamond sparkle

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Answer 2

Answer:

Diamonds get their brilliance from three things: reflection, refraction and dispersion. ... Only a portion of the light hitting a diamond is reflected; the rest travels through it. As the light moves through the diamond, it is scattered and fractured, creating the sparkle that diamonds are known for.

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