What is a black diamond? The black diamond is a very particular rare stone known for its incredible beauty, discover black diamond meaning and what it is worth. There was a soccer player in the thirties, the phenomenal Brazilian Leonidas da Silva, who had a decidedly guessed nickname: the black diamond. Both for the color of its skin and because black diamonds are precious as well as very rare. But what matters most is that they are also wonderful to see because black diamonds are very different from white diamonds or any other diamond. It is not only the color