Botswana's diamond miners seem to be on a roll in terms of finding massive gems.

Bloomberg points out that Lucara, the same mining company that found this one, found a 472-carat stone just two weeks ago.

But this is nothing.

In 2015 the world's second biggest diamond was discovered in Botswana. The 1,111-carat stone was the size of a tennis ball.

Reuters

The largest ever diamond was 3,106-carats. It was found in 1905 only nine metres from the surface in South Africa and was extracted using a pocket knife.

Some suggest that the 110 year gap between the two big gems was down to the mining equipment changing.

It is speculated that the old sorting machines were actually breaking the diamonds.