Debswana unveiled on Wednesday a three-inch-tall, 1,098-carat, gem-quality rough diamond discovered at its Jwaneng mine in Botswana. Estimated to be worth more than $55 million, the gem ranks fourth on Wikipedia's list of the largest rough diamonds of all time. Debswana's acting managing director Lynette Armstrong presented the stone to Botswana President Mokgweetsi Masisi on […]