Lucara Diamond plans next month to organize a second tender for "exceptional" diamonds mined at the Botswana Karove mine, which was commissioned two years ago.
The company said that 16 lots weighing from 30.69 to 258.69 carats will be auctioned.
Lucara added that 5 more lots of diamonds will be offered at the tender, each weighing over 109 carats.
A preliminary diamond survey will be held in Antwerp from 3 to 10 July and in Gaborone from 14 to 16 July.
Since the beginning of the development of the central and southern part of the kimberlite body in the 1st quarter of 2013, the Karove diamond mine has become known as a source of exceptional diamonds.