So - diamonds aren't rare on Earth, and it may not be rare in space either. In 2004, astronomer Travis Metcalfe of the Harvard-Smithsonian Center for Astrophysics and colleagues discovered a diamond star that is 10 billion trillion trillion carats!
The cosmic diamond is a chunk of crystallised carbon, 4,000 km across, some 50 light-years from the Earth in the constellation Centaurus.
It's the compressed heart of an old star that was once bright like our Sun but has since faded and shrunk.
Astronomers have decided to call the star "Lucy" after the Beatles song, Lucy in the Sky with Diamonds.
According to scientists, if you wait long enough, our own sun will eventually turn into one such large diamond star!
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