What is the hardest natural substance on Earth?

The Hardest Natural Substance

Diamond: Exploring the Hardest Natural Substance on Earth

As a professional engineer, I love engaging readers in the fascinating world of science. Today, let’s delve into an intriguing question that many wonder about: What is the hardest natural substance on Earth? The answer lies in the extraordinary material known as diamond.

Diamond: Nature’s Unyielding Masterpiece

Diamond is the hardest naturally occurring substance on our planet, boasting exceptional properties. Here are some key aspects of this incredible material:

  • Formation: Diamonds form deep within the Earth’s mantle under extreme heat and pressure.
  • Composition: Composed of carbon atoms arranged in a unique crystalline structure, giving them unparalleled strength.

Diamonds Beyond Gemstones: Industrial Applications

While diamonds are synonymous with jewelry, their unmatched hardness makes them invaluable for various industrial uses:

  • Cutting Tools: Diamond-tipped drills and saws offer superior cutting performance for materials like concrete, glass, and metals.
  • Abrasion: Its powder is used for polishing and grinding other hard materials due to its unrivaled abrasive properties.

Measuring Hardness: The Mohs Scale

The hardness of minerals, including diamond, is measured using the Mohs scale, which ranges from 1 (softest) to 10 (hardest):

  • Top of the Scale: Diamond, with a rating of 10, reigns supreme as the hardest known natural substance.
  • Runner-up: Corundum, which includes ruby and sapphire, follows at a 9 on the Mohs scale.

Scientific Pursuits: Creating Harder Synthetic Materials

The search for even harder materials has led to the development of synthetic substances that rival or surpass it:

  • Ultrahard Fullerite: A carbon-based material that, under certain conditions, is harder than it and holds potential for future applications.


In conclusion, it holds the title of the hardest natural substance on Earth, with its extraordinary properties making it invaluable for both gemstones and industrial applications. As we continue to push the boundaries of material science, we might one day uncover or create substances that outshine even the remarkable diamond. Until then, let’s appreciate the unrivaled strength and beauty of nature’s indestructible masterpiece.


  1. Geology.com
  2. American Museum of Natural History
  3. Gemological Institute of America (GIA)
  4. Smithsonian Institution
  5. National Geographic
  6. ScienceDirect

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