136.24-carat diamond recovered by Alrosa

Mining firm Alrosa Group has announced the recovery of a 136.24-carat diamond from its Nyurbinskaya mine.

The gem-quality rough diamond, which is 3 Black Makeable 1 Сolour, measures 29.32 х 23.88 х 21.9 mm and is one of the largest rough diamonds ever to be recovered at the mine.

Currently unnamed, the stone is formed of translucent colorless parts of a crystal with a columnar interlocking sculpture. It contains a graphite and sulphide composition.

The Nyurbinsky open-pit mine was put into operation in 2001 and accounted for 13% of Alrosa’s rough diamond production last year.