It has been proposed that diamonds exist in carbon-rich stars, particularly white dwarfs; Carbonado, a polycrystalline mix of diamond, graphite, and amorphous carbon, which is one of the hardest natural forms of carbon, is also present, and could come from supernovae and white dwarfs. The white dwarf BPM 37093, is located away in the constellation Centaurus, has a diameter of 2,500-miles (4,000 km), and may have a diamond core, which would make it one of the largest diamonds in the universe. For this reason it was given the nickname Lucy.
