The largest diamond ever found was a carbonado from Brazil; named Sergio, the stone weighed 3,167 carats. (One carat equals one-fifth of a gram.) The origins of carbonados have long baffled ...

Also known as a carbonado diamond, it is possible the black diamond came from outer space. Carbonados of this structure have only been found in Brazil and the Central African Republic, and ...

“Today we are extremely excited to present The Enigma, a truly rare fancy black carbonado diamond weighing a staggering 555.55 carats with precisely 55 facets, a technical feat for one of the ...

Black diamonds, or Carbonado diamonds, go back 2.6 billion to 3.8 billion years and some experts believe they may have been formed in supernova explosions. The diamonds lack traces of minerals fo ...