DiamondBuzz
ALROSA’s Severalmaz ramps up output as Karpinsky-2 diamond pipe enters development
Russian diamond giant ALROSA has begun full-scale development of the Karpinsky-2 kimberlite pipe at the M.V. Lomonosov diamond field in the Arkhangelsk region, marking a major step forward for its local subsidiary, Severalmaz. Karpinsky-2 becomes the third active pipe at the site, alongside the existing Arkhangelsk and Karpinsky-1 operations.
Karpinsky-2 holds more than 40 million tonnes of diamond-bearing ore and was first evaluated in 2018 through pilot mining operations, which confirmed its commercial viability. Preparatory work for full development began earlier this year, and the project officially moved into the design phase during a recent visit by ALROSA CEO Pavel Marinychev.
Marinychev, who personally launched the design stage, also assessed Severalmaz’s performance for 2025 during his visit. In the first five months of the year, the company surpassed its ore extraction targets and improved operational efficiency, resulting in a 9.4% increase in ore processing. These gains translated into the production of more than 1.2 million carats of rough diamonds.
The CEO also reviewed progress on a new water recycling system at the Lomonosov processing plant and emphasized the importance of completing a gym facility for workers at the shift village by year-end, highlighting the company’s focus on both sustainability and employee well-being.
“I am sure that the work of the Severalmaz team will drive the enterprise’s continued growth. We remain committed to providing safe working conditions and contributing to the development of the Arkhangelsk region,” Marinychev stated.
ALROSA, which produces about 30% of the world’s diamonds and 90% of Russia’s output, reported production of 33 million carats in 2024. The company’s proven reserves exceed 1 billion carats, solidifying its position as the global leader in diamond mining.
DiamondBuzz
CVD Synthetic Fashioned To Imitate A Rough Natural Diamond
The Near-Colorless Stone Is Believed To Be The First Time Creators Of A Synthetic Chemical Vapor Deposition (CVD) Diamond Have Shaped It To Resemble A Rough Diamond
The 6.87-carat near-colorless CVD diamond was shaped to resemble a natural rough octahedral crystal but showed distinct synthetic features under microscopic and spectroscopic analysis.GIA’s tests confirmed the stone’s synthetic origin, noting polishing marks, facet junction roughness, and luminescence patterns inconsistent with natural diamonds.
No evidence currently suggests widespread substitution of synthetics for rough natural diamonds, but existing detection tools could be adapted if such cases increase.
The near-colorless stone is believed to be the first time creators of a synthetic chemical vapor deposition (CVD) diamond have shaped it to resemble a rough diamond, according to an article in the spring issue of the institute’s Gems & Gemology quarterly journal.
Upon investigation with the use of raman spectroscopy, the results confirmed that the material was a diamond, with its near-octahedral shape similar to that of a natural rough crystal. Further analysis showed that it was not a true octahedron, as only one set of opposing faces was parallel. Microscopic observation under differential interference contrast revealed extremely flat faces marked mainly by parallel polishing lines, unlike the growth steps and trigons typically seen on natural octahedral faces. The facet junctions were extremely rough, possibly due to measures taken to improve the color, after which the main faces appear to have been repolished, the institute explained.
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