Diamond found yield one of the largest and highest quality of polished stones . 478-carat diamond proved it to be of the highest color grading available . Watch more on the diamond » . Diamond found in Letseng Mine , in Lesotho .
Diamond found yield one of the largest and highest quality of polished stones . 478-carat diamond proved it to be of the highest color grading available . Diamond found in Letseng Mine , in Lesotho .