The stone would be worth more than $6 million today and is the purest red diamond in the world.

Boron-containing species in the chamber, even at very low trace levels, also make it unsuitable for the growth of pure diamond.

The thermal conductivity of pure diamond is the highest of any known solid.

This means pure diamond should transmit visible light and appear as a clear colorless crystal.

Your little fellow here is either a highly pure diamond - or something unknown on earth that's even harder!

Hemmed in by defensive walls newly built of the purest diamonds, the shades were allowed to rest.

Her voice was like a diamond, pure and cool, and she was singing a song to him in French.

"The transport tubes are also pure diamond," Levinson said.

The name Gurupi is a Tupi word meaning "pure diamond".

Making them tumble upon each other, like magnets made of diamonds, pure and clean.