A general view of rough diamonds at the Diamond Trading Company (DTC) Botswana in Gaborone on May 4, 2026. The key activity of DTC Botswana is sorting and valuation of rough diamonds. When diamonds arrive from the mines, they are sorted into different categories according to their carat, cut, clarity, and colour. (Photo by Monirul Bhuiyan / AFP via Getty Images)

A diamond sorter sorts rough diamonds at the Diamond Trading Company (DTC) Botswana in Gaborone on May 4, 2026. The key activity of DTC Botswana is sorting and valuation of rough diamonds. When diamonds arrive from the mines, they are sorted into different categories according to their carat, cut, clarity, and colour. (Photo by Monirul Bhuiyan / AFP via Getty Images)

A general view of a rough natural diamond at De Beers in Gaborone, Botswana on May 4, 2026. (Photo by Monirul Bhuiyan / AFP via Getty Images)

A diamond sorter sorts rough diamonds at the Diamond Trading Company (DTC) Botswana in Gaborone on May 4, 2026. The key activity of DTC Botswana is sorting and valuation of rough diamonds. When diamonds arrive from the mines, they are sorted into different categories according to their carat, cut, clarity, and colour. (Photo by Monirul Bhuiyan / AFP via Getty Images)

A diamond sorter sorts rough diamonds at the Diamond Trading Company (DTC) Botswana in Gaborone on May 4, 2026. The key activity of DTC Botswana is sorting and valuation of rough diamonds. When diamonds arrive from the mines, they are sorted into different categories according to their carat, cut, clarity, and colour. (Photo by Monirul Bhuiyan / AFP via Getty Images)

World Athletics president Sebastian Coe holds a rough natural diamond as he tours Diamond Trading Company (DTC) Botswana in Gaborone on May 4, 2026. The key activity of DTC Botswana is sorting and valuation of rough diamonds. When diamonds arrive from the mines, they are sorted into different categories according to their carat, cut, clarity, and colour. (Photo by Monirul Bhuiyan / AFP via Getty Images)

A diamond sorter sorts rough diamonds at the Diamond Trading Company (DTC) Botswana in Gaborone on May 4, 2026. The key activity of DTC Botswana is sorting and valuation of rough diamonds. When diamonds arrive from the mines, they are sorted into different categories according to their carat, cut, clarity, and colour. (Photo by Monirul Bhuiyan / AFP via Getty Images)

A general view of a rough natural diamond at De Beers in Gaborone, Botswana on May 4, 2026. (Photo by Monirul Bhuiyan / AFP via Getty Images)