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Diamond has a very high refractive index: 2.4, with dispersion of 0.044. These are physics measurements.

Because the natural mineral possesses these extraordinary physical properties, a gemstone diamond cut and polished to the appropriate geometric angles and shapes can 'bounce' light around in the stone and reflect it back through the top -- table -- into the eye of the beholder.

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Q: Why diamond have extraordinary brilliance?
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The reason is its cut, the facets presented to light, which reflect as brilliance.


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Give you a sentence for brillance?

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What is the brilliance of Moissanite as compared to that of diamonds?

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Which diamond has the highest carat of shine?

This question doesn't quite make sense. A carat is a measure of the weight of the diamond, and measures nothing else at all. One carat = 200 mg or 1/5 of a gram. By 'shine' you probably mean brilliance; this can be measured by the return of light from the diamond. Clarity and colour both mean what they say, and don't really affect brilliance, which depends entirely on the cut. The cut which gives the most brilliance is known as the ideal cut.


What are some of the meanings of the term 'Brilliance'?

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