At 2.33 carats, it ranks among the largest diamonds ever to have received the “Fancy red” color grade from the Gemological Institute of America (GIA). Researchers estimate that less than one ...

which is owned by Lucara Diamond Corp. The diamond is believed to be the second-largest ever found. It is surpassed only by ...

one of the largest rough diamonds ever unearthed, from its Karowe mine in Botswana. The Botswana government said the diamond ...

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 ...

including a 2,492-carat stone discovered last year that was the second-biggest diamond ever dug out of a mine and the biggest in more than a century. That gem was found by Canadian mining firm Lucara.