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ansh36

Diamond is the hardest natural substance on the earth.

Explanation:

Diamond is the hardest naturally occurring substance found on earth. Diamond also bend and reflect light and break it up into the colour of the rainbow, which is what gives them their sparkle.

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Answer:

Diamond.

Explanation:

DIAMOND.

This is a rare and hardest naturally occuring mineral composed of pure carbon.

It is used in polishing other gemstones minerals such as Tanzanite.