London: Gem Diamonds has discovered an 80-carat rough stone that it has described as one of the highest-quality diamonds ever found at its Letšeng mine in Lesotho.

The D-color, type-II diamond is relatively small compared with some of the huge stones the mine has produced over the years, including a 114-carat gem the company extracted last month. However, few previous discoveries match this one for quality, the company said Thursday.

The stone “is entirely undamaged, making this a significant recovery,” stated Gem Diamonds CEO Clifford Elphick.