A newly discovered 478-carat diamond (and the 20th largest ever found), could become a new "world's largest round cut diamond". Initial analysis suggests that the stone may have a flawless center and could dwarf the "Kohinoor" diamond that is part of the Crown Jewels which weighs in at 150-carats. <via>
September 27, 2008
On October 15th, Christie's will be auctioning (among other beauties), two stones cut from the 316.15-carat "Ponahalo" diamond. The smaller stone weighs in at 70.87-carats and the larger stone is an impressive 102.11-carats. It took a year-and-a-half to fashion the stones from the original rough cut diamond.