Why does a diamond sparkle so beautifully?

The sparkle of a diamond has to do with the way it reflects light. And that comes from the quality of the cut. A talented diamond cutter knows how to create a fascinating play of light and colour each time the diamond is moved. That play of light is actually a combination of brilliance (reflection), fire (rainbow flashes) and scintillation (changes between light and dark areas). All these elements explain how a diamond sparkles as no other gemstone.

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