But wait! Thats not the end of the story. Those are the biggest diamonds on earth, but their size is pitiful compared to the biggest diamond in the universe: BPM37093, aka the diamond star, at 10 billion trillion trillion carats! Dubbed Lucy (from the Beatles song Lucy in the Sky with Diamonds), its the compressed heart of an old star that was as bright as our sun but is now faded and miniscule. But the chunk of crystallised carbon is still a mind-boggling 4,000 kilometers in diameter.

Artists impression of what the diamond will look like

If you think youd like to get some of it to bring back home, theres a small problem: its 50 light-years away from here. That means light takes 50 years to reach it. And another 50 get back here. Hence, travelling at the speed of light, youll still never make it - the round trip alone takes 100 years.

Equipment is another problem. Astronomer Travis Metcalfe, who led the team of researchers that discovered Lucy said that youd need a jewellers loupe the size of the sun to grade this diamond. So how lah?

Perhaps the sun is a better choice. It will become a white dwarf too, and light only takes 8 minutes to reach it.

However, the wait is a little bit too long for most of us. Astronomers said that it will only become a giant diamond 7 billion years from now, when its ember core crystallises.