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www.reference.com/article/hardest-material-earth-47d3cef59b8c369d

As for 2014, the hardest material on earth is a diamond, a form of pure carbon. It ranks 10 on the Mohs hardness scale and has a rating of between 70 and 150 GPa, or gigapascals on the Vickers hardness scale.

www.reference.com/article/old-mankind-38930682d6e42e1d

Anatomically modern humans, Homo sapiens sapiens, are a 150,000-year-old subspecies responsible for the entirety of recorded history and civilization. The human species, Homo sapiens, is currently believed to date back nearly 200,000 years.

www.reference.com/article/hardest-substance-known-man-5fe176a3169c9e72

The hardest known substance is lonsdaleite, also called hexagonal diamond, according to a study published in Physical Review Letters and reported on Phys.org. Lonsdaleite is 58 percent stronger than diamond, which was previously considered to be the hardest substance.

www.reference.com/article/hardest-metal-world-db45f22c120b53ad

Alloyed steels, steel combined with other elements to increase their hardness and strength, are the hardest known metals. Maraging steel, a heat-treated steel, is one of the strongest steel alloys.

www.reference.com/article/hardest-rock-earth-402c36f284c19e4c

There's no single hardest rock on Earth. The strongest types, on the other hand, include quartz in their makeup: quartzite, quartz sandstones, rhyolites and granites, according to the MadSci Network.

www.reference.com/article/hardest-metal-earth-ab13c4e3e9814f4a

Maraging steel is the hardest metal on Earth. This steel is an alloy of nickel, cobalt and molybdenum. Most of the hardest metals are not naturally occurring; instead, they are man-made alloys.

www.reference.com/article/hardest-metal-9060987517dc7966

Maraging steel, which is a super-strong steel, is the hardest-known metal in the world. It is an iron alloy that contains high amounts of cobalt, nickel and molybdenum.