DiamondBuzz
Alrosa confirms it is suspending production at its low-margin mines
Alrosa has confirmed that it is suspending production at its low-margin mines amid what it calls a “deep crisis” in the industry. The sanctioned Russian miner said last November it was considering such a move, but would wait and see what happened to rough prices.
Mining at the Verkhne-Munskoye deposit’s Zapolyarny and Magnitny open pits will now be suspended from June 15, and at alluvial deposits in the Anabar River valley – Khara-Mas and Ochuos, operated by Alrosa’s subsidiary Almazy Anabara – from April 1.
The suspension of activity at all deposits producing under 1m carats will reduce direct costs by $107m (RUB 9bn) during the year, the company said in a statement. They account for 3 per cent of Alrosa’s total output.
Alrosa also said forecast production for 2025 would remain unchanged at 29m carats. Ore already mined at the smaller deposits would ore mined at the deposits continue to be milled until next year, it said.
Earlier this month Alrosa reported a 77 per cent slump in profits for 2024 (down to $223m) after G7 sanctions were tightened last March to include Russian goods regardless of where they were cut and polished. The company has said it could lay off some of its 35,000 workers and ii is expected to offload more of its diamonds to Gokhran, the state-run depository.
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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