The 'Ruby', a Malta-flagged cargo ship loaded with 20,000 tons of ammonium nitrate, departed from the port on September 4, 2024. Tim Graham/Getty Images Russia is one of the world's largest exporters ...

the stone appears to be not far behind the largest gem-quality diamond ever mined, the 3,016.75-carat Cullinan Diamond discovered in South Africa in 1905. World’s most expensive ruby ...