Is a Diamond Truly the World's Hardest Material?

Indeed, diamond is the hardest material in the world. Material hardness is a property determined by scratch resistance. A substance can only be scratched by something of equal or greater hardness. Therefore, only a diamond can scratch another diamond.

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Why are diamonds valuable?

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Is a Diamond Truly the World's Hardest Material?

Material properties of diamond - Wikipedia

Is Diamond Really The Hardest Material Known To Us?

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Diamond: the world's hardest material now can be 3D printed