Even on Earth newly- mined diamonds sometimes fly to pieces from internal stress.

Maybe it was some other country that mined diamonds.

So what are lab grown diamonds, and are they really a more sustainable alternative to traditional mined diamonds?

There's a debate raging about whether diamonds created in a laboratory will start to threaten the popularity of natural, mined diamonds.

It took the team more than five years to get the technique right, ensuring they are physically and chemically identical to Earth- mined diamonds.