Probably the largest diamond in our galaxy: a crystalized star 4,000km across - 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 is the compressed heart of an old star that was once bright like our Sun but has since faded and shrunk.
The diamond star completely outclasses the largest diamond on Earth, the 546-carat Golden Jubilee which was cut from a stone brought out of the Premier mine in South Africa.
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