DiamondBuzz
Alrosa Unearths Largest Gem-Quality Diamond in Russian History
Russian diamond mining giant Alrosa has unearthed the largest gem-quality diamond ever discovered in the country. The rare amber-coloured crystal weighs an impressive 468.30 carats and measures 56 x 54 x 22 mm. It was recovered in the Republic of Sakha (Yakutia).
“This year will undoubtedly mark a historic milestone for Russia’s diamond industry,” said Alrosa CEO Pavel Marynichev. “In early April, we unveiled the largest diamond ever cut in Russia — over 100 carats, which took more than two years to polish. And now, nature has gifted us this extraordinary discovery. It is the biggest gem-quality diamond ever mined in Russia.”
In tribute to the 80th anniversary of the end of World War II, the diamond has been named “80 Years of Victory in the Great Patriotic War.”
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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