Scientists Created a Crystal That's 58% Harder Than Diamond

9 Most Exotic Materials in the World, by Dyedo Tikio

Carmeltazite: Extraterrestrial Mineral Harder And Rarer Than Diamonds

Mysterious diamonds discovered in space could be tougher than any gem on Earth

Scientists Find Weird Ultra-Strong Diamonds From Obliterated Dwarf Planet

Can scientists make a material harder than a diamond? - Quora

The quest to make a crystal harder than diamonds

Scientists discover ultra-strong diamond created by a dwarf planet

Harder Than Diamond: Is There Any Material That Is Stronger Than the Precious Crystal?

The quest to make a crystal harder than diamonds

There Are 6 'Strongest Materials' On Earth That Are Harder Than Diamonds, by Ethan Siegel, Starts With A Bang!

Opinion: Harder than diamond: have scientists really found something tougher than nature's invincible material?

Puzzle Solved: New Near Unbreakable Material Rivals Diamond in Hardness

Rare hexagonal diamond formed by asteroid/planet crash • The Register

How can we be sure that diamonds are the hardest substance in the world if the hardness scale was tested before we had access to every substance in this world? - Quora