黑钻石（又称黑金刚石或Carbonado）是一种发现在中非共和国及巴西冲积矿床的天然多晶金刚石。它的自然颜色是黑色或暗灰色，比其它钻石有更多更孔隙。

除了另行说明外，黑钻石的特点在这部分是由Heaney et al. (2005)的摘要指出。

黑钻石由于有许多微小的黑色晶体，通常有豌豆大小或更大的聚合多晶体。最独特的是，只有中非共和国及巴西能发现黑钻石，极小部分发现在南非共和国，但却没有在通常发现钻石的庆伯利岩中发现。铅同位素分析晶体约于3亿年前形成，在年轻的沉积岩中。

Carbonado, commonly known as the "black diamond", is the toughest form of natural diamond. It is an impure form of polycrystalline diamond consisting of diamond, graphite, and amorphous carbon. It is found primarily in alluvial deposits in the Central African Republic and in Brazil. Its natural colour is black or dark grey, and it is more porous than other diamonds.