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Abstract <p>The Russian Federation is the world leader in diamond mining, but finds of large gem-quality diamonds over 50 carats are very rare for its deposits. The 342.5-carat XXVI Congress of the CPSU diamond was extracted in 1980 from the Mir kimberlite pipe and is still the largest gem-quality diamond mined in Russia. In 2023, a 390.65-carat high-gemstone diamond fragment was discovered at the Ebelyakh placer deposit (Western Yakutia). A 3D reconstruction of the entire diamond crystal suggested that it was a dodecahedroid in shape, elongated along the L3 axis, with a weight of ~1500 carats; this is the largest gem-quality diamond fragment found in the entire history of diamond mining in Russia. Here, we report the results of a comprehensive study of a large diamond fragment with a weight of 390.65 carats for the first time. The studies were conducted at the Gokhran of Russia and PJSC ALROSA using optical microscopy, photoluminescence, and IR spectroscopy. An inclusion found in the diamond was studied using Raman scattering. It was shown that the diamond belongs to type IIa, according to the physical classification and contained a single small inclusion related to sulfide association. It was established that based on the set of features the studied diamond could be classified as a CLIPPIR diamond. The authors attempted to study the patterns of the formation of this unique diamond.</p>

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The First Find of a Large CLIPPIR-Group Diamond in the Ebelyakh Alluvial Deposit (Yakutia)

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • G. Yu. Kriulina,
  • L. D. Bardukhinov,
  • E. M. Sedykh,
  • R. V. Eremeev,
  • M. B. Kopchikov,
  • O. A. Shilova,
  • A. I. Vasina,
  • L. A. Demidova

摘要

Abstract

The Russian Federation is the world leader in diamond mining, but finds of large gem-quality diamonds over 50 carats are very rare for its deposits. The 342.5-carat XXVI Congress of the CPSU diamond was extracted in 1980 from the Mir kimberlite pipe and is still the largest gem-quality diamond mined in Russia. In 2023, a 390.65-carat high-gemstone diamond fragment was discovered at the Ebelyakh placer deposit (Western Yakutia). A 3D reconstruction of the entire diamond crystal suggested that it was a dodecahedroid in shape, elongated along the L3 axis, with a weight of ~1500 carats; this is the largest gem-quality diamond fragment found in the entire history of diamond mining in Russia. Here, we report the results of a comprehensive study of a large diamond fragment with a weight of 390.65 carats for the first time. The studies were conducted at the Gokhran of Russia and PJSC ALROSA using optical microscopy, photoluminescence, and IR spectroscopy. An inclusion found in the diamond was studied using Raman scattering. It was shown that the diamond belongs to type IIa, according to the physical classification and contained a single small inclusion related to sulfide association. It was established that based on the set of features the studied diamond could be classified as a CLIPPIR diamond. The authors attempted to study the patterns of the formation of this unique diamond.