A display of diamonds shows coloured, fancy brownish greenish yellow oval diamond, 50,21 carats (C), among other stones at Alrosa Diamond 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)