A diamond cutter inspects a diamond at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A diamond cutter inspects a diamond at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A diamond cutter polishes a diamond at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

Russian Alrosa Diamond Deputy Director for sales Yevgeny Tsybukov shows a coloured, fancy brownish greenish yellow oval diamond, 50,21 carats, at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A display of diamonds shows coloured, fancy brownish greenish yellow oval diamond, 50,21 carats (C), among other stones at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects a rough diamond, with its 3d model at a monitor, at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A diamond cutter inspects a diamond at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects a rough diamond at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A laser machine cuts a diamond at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A diamond cutter inspects a diamond at Alrosa Dimond Cutting Division in Moscow on July 3, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A view of Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An excavator loads diamond ore into a haul truck at Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

Visitors inspect an excavator and a haul truck at Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A driver checks the pressure in a haul truck tyre in Nakyn settlement, some 340 kms North-East from the town of Mirny on July 2, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee gestures next to an excavator and a haul truck at Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A view of Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A view of Nyurbinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Nyurbinsky diamond mining pit has now depth of 375 meters, with a project depth of 570 meters, having 4,6 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A view of Nyurbinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Nyurbinsky diamond mining pit has now depth of 375 meters, with a project depth of 570 meters, having 4,6 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A view of Nyurbinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Nyurbinsky diamond mining pit has now depth of 375 meters, with a project depth of 570 meters, having 4,6 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

Employees inspect Nyurbinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Nyurbinsky diamond mining pit has now depth of 375 meters, with a project depth of 570 meters, having 4,6 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

Haul trucks carry the ore out of Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A view of Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee gestures next to an excavator and a haul truck at Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A haul truck approaches an excavator at Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A haul truck carries the ore out of Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A view of Botuobinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Botuobinsky diamond mining pit has now depth of 130 meters, with a project depth of 580 meters, having 6,2 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A woman walks towards the airport of the settlement of Nakyn, Alrosa diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee stands on the edge of Nyurbinsky diamond mining pit of Nakyn diamond ore field, some 340 kms North-East from the town of Mirny on July 2, 2019. - The Nyurbinsky diamond mining pit has now depth of 375 meters, with a project depth of 570 meters, having 4,6 carats of diamonds per one tonne of kimberlite ore in this pipe. Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

Rough diamonds are seen in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A view of the first Soviet diamond mining pit, called Mir, operated 1957-2001 in the town of Mirny on July 1, 2019, with the town in the background. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A view of the first Soviet 'Mir' diamond mining pit, operated 1957-2001 in the town of Mirny on July 1, 2019, with the town in the background. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

Rough diamonds are seen in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee pours rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A counter calculates a flow of rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

Rough diamonds are seen in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee puts rough diamonds into a counter in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee pours rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

Rough diamonds are seen in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

Rough diamonds are seen in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee weights rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

A central part of a composition of 14.000 carats of rough diamonds worthing around USD 9 million displayed in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

An employee inspects rough diamonds in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)

Visitors inspect a composition of 14.000 carats of rough diamonds worthing around USD 9 million in Alrosa Dimond Sorting Center in the town of Mirny on July 1, 2019. - Russian Alrosa gets its diamonds in the permafrost abyssal holes dug with explosives in the permanently frozen ground of Yakutia, an isolated region in East Siberia, the home to the huge diamond deposits that ensure Russia's supremacy in world production. (Photo by Alexander NEMENOV / AFP)