Russian diamond miner Alrosa unearthed a gem-quality stone weighing 118.91 carats on April 16th, the eve of the launch of Zarya - a new deposit of ALROSA at Aykhal Mining and Processing Plant. It is the largest gem-quality diamonds found at the ‘International’ pipe over the past two years. The mined crystal is one of the largest gem-quality diamonds extracted from the ground at the mine ‘International’ in recent years; a similar large gem-quality diamond (109.61 carats) was mined here in summer of 2017.
"Well-known hallmarks of the diamonds from the "International" kimberlite pipe are regular shapes and purity," explains Evgeny Agureev, Member of the Management Board, Director of the United Selling Organization at ALROSA. "That is exactly the pipe that most often brings ALROSA regular shape octahedrons with smooth edges." The miner further explains that the kimberlite pipe ‘International’ was discovered in 1969 by geologists of the Botuobinsky expedition. By the time of development, the reserves of the deposit ‘International’ were more than 100 million carats. Alrosa says the field is the world leader in diamond content, delivering a high-quality product. The average content in different periods of mining reached 12 ct/t, with an average content of 7 ct/t (in accordance with the recommendations of the JORC Code). This is the world's largest carat content per tonne of ore, the company says.