It is simple - they always exaggerate the truth. Take Gizmodo for example…
I mean, come on… scientists have barely discovered the first signs of what could be a pure diamond based planet, how on earth can anyone abuse hyperbole to this extent of pure lies? How does this journalist know that there are not other larger diamonds in the form of asteroids or dead stars in the universe, as it is an immense area and impossible to fully explore? That title is misleading, and all it needed was one little word:
The Biggest Known Diamond in the Universe Is Actually a Planet
But noooooooo… He cannot even claim that he was out of print space, as this is an online article. Shame on you.