Leader-quotes Quote by Donavan Nelson Butler, Master Sergeant US Army

“Diamond is the hardest substance, but the Irony, it is also brittle.”

— Pushkar Saraf

The brightest and most valuable diamond started life as just a lump of carbon

— Peter Dilger

“Contrary to popular belief, diamond is not the hardest material known to man. The hardest material in the universe is dried egg yolk. And…

— Ron Brackin

“What do I and a diamond have in common? We are tough, brilliant, and carbon based entities which evolved into something better under immense…

— Donavan Nelson Butler, Master Sergeant US Army

The hardness of a diamond is part of its usefulness, but its true value is in the light that shines through it.

— B.K.S. Iyengar

A diamond is just a piece of charcoal that handled stress exceptionally well

— Anonymous

Diamonds are the hardest thing known except ... the human will.

— Superman

A diamond is merely a lump of coal that did well under pressure. So imagine how brilliant a human being can be by sustaining…

— Babloo

“Diamonds were nothing more than carbon, but carbon in a crystal lattice that made it the hardest known mineral in nature. That was the…

— Alan Bradley

The diamond is the hardest stone -- to get.

— Evan Esar

“A diamond is just a rock that refused to break under heat and pressure.”

— Matshona Dhliwayo

“Diamonds are only lumps of coal that stuck at it no matter how much heat or pressure they faced.”

— Jeffrey Fry