In which of these natural gemstones does light travel at its slowest speed?
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Light slows down when passing through dense materials. Because diamond has an exceptionally high refractive index of about 2.42, light travels through it at less than half its speed in a vacuum (around 124,000 kilometers per second). This extreme slowing and bending of light is what gives a well-cut diamond its signature brilliant sparkle! Photo: ajizai, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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