Answers

2016-03-02T20:03:41+05:30
Diamond has a high refractive index, so it reflects all lights that incident on it,making it sparkle
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2016-03-02T20:12:41+05:30
The high refractive index due to its cutting. thus, light undergoes total internal reflection, and light, when entered the diamond, gets bounced everywhere before coming out, thus its sparkling appearance.

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