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

The only red diamond known to exist in the entire world.

Think of it; a genuine red diamond would have a value beyond measure.

The kidnappers believe the number will lead them to a valuable red diamond.

But the man was not perturbed: he knew that a red diamond under green light always looked black.

Until now, there were only seven known red diamonds in the world.

She painted the floor in red and white diamonds.

"The owner came to us after the phenomenal price was paid here in April for the red diamond."

The name is a play on the company's logo, a red diamond.

A red diamond,' I said, in a pause that seemed to require some response.