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This is an effect due to the "refractive index" of gemstones and the principle known as "total internal relection". Light entering the stone is bent (refracted), split into its component colours (like in a rainbow) and reflected around inside by the facets (flat cut faces) of the stone until it re-emerges from the stone to give it a characteristic "sparkle".

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What is the gem property reflects light?

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Does gold have the ability to reflect light?

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What type of property is colour?

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Do pearls reflect light?

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