How Is This Even Possible?
The universe's biggest showoff actually used to be a star, and sometimes the debris that's left over after the star dies starts a second career as a planet. In this case, Blingworld started off life as one of two parts of a binary star. The larger twin made like a bomb and supernova-ed. What was left behind was a pulsating star, or pulsar, and a white dwarf. The dwarf stabilized just far enough away from its former brother to lose matter to the bully but to keep its carbon core.
What a dick!
Carbon is just a shitload of heat and pressure away from becoming a diamond. On Earth, that happens underground and creates little shiny bits for people to dig up and cram into their jewelry. But in this particular spot in space, the conditions were just right for the entire interior of that former star to harden, crystallize and turn into a planet-sized gem.
Damn it, mankind's single goal should now be to assemble a mission to tow this bastard back to Earth. There's one pawn shop owner who's going to be in for a big fucking surprise.
"Yeah, that's cute. Get your telescope and come with me."