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.

What is the hardest material in existence? - Quora

How Rough Diamonds Are Used in Industry – The Raw Stone

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GIA on X: #FunFact: #Diamond is 58x harder than any natural substance making it the hardest material on Earth. / X

Bending the world's strongest material on the nanoscale - Advanced Science News

The sparkling rise of the lab grown diamond

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Are Diamonds The Hardest Substance On Earth? - Diamond101

Top 10 gem diamonds ideas and inspiration

Are diamonds unbreakable? - Royal Coster Diamonds

Can you damage a diamond? - BAUNAT