Diamonds aren't always colorless; they can also be blue, yellow, green and even pink. But what makes these jewels come in varied hues? After forming, diamonds need to rise to the surface very quickly ...

Diamonds form deep within the Earth's mantle, around 250 kilometers below the surface, where immense pressure (up to 10 GPa) and temperatures (around 2,200 °C) compress carbon into diamonds over ...

Add Yahoo as a preferred source to see more of our stories on Google. They don’t make them like they used to — at all. It can take natural diamonds over three billion years to grow, but researchers in ...