Q:

According to physics, why do diamonds sparkle?

A:

Quick Answer

The brilliant sparkle of a diamond occurs from refraction and the total internal reflection of light. The precisely cut surfaces of a diamond refract or redirect incoming light until it is reflected back out of the facets of the top to the observer's eyes.

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Full Answer

Diamonds are graded based on their ability to return light, also known as performance. More light refracted through the top facet leads to higher the light performance and a higher grade for the diamond. If a diamond is cut too shallow or too deep, the light leaks out of the bottom of the diamond and reduces its brilliance.

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