Scientists Find Diamond Planet Whirling dead star crystallized carbon into a 12-mile gem By Polly Davis Doig, Newser Staff Posted Aug 25, 2011 7:03 PM CDT Updated Aug 28, 2011 5:54 PM CDT 50 comments Comments Astronomers have found a 12-mile diamond planet whirling in the sky. (Swinburne Astronomy Productions) (Newser) – If a diamond is a girl's best friend, then maybe women aren't from Venus, after all: Astronomers combing the southern sky have found a diamond planet, reports Space.com. Dubbed the rather unglamorous PSR J1719-1438, the alien planet is the remnant of a dead star and spins 10,000 times a minute around a white dwarf—creating pressure so high that the dead star's carbon has been crystallized into an actual diamond. The planet is about 12 miles across, reports Reuters, but has 1.4 times the density of our sun. But just like a diamond, the trip is forever: The planet is about 4,000 light-years from Earth. Watch a video explaining the phenomenon over at Space.com.