There is an industrial development of these placers of the northern regions of the Yakut diamond province, a subsidiary of ALROSA «Almazy Anabara». Therefore, there is a need for a detailed study of yellow diamonds, at least for understanding in what specific conditions and in which part of the mantle they formed.īased on the complex study, the geologists concluded that the yellow diamonds probably have crystallized from the remains of organic matter (the remains of living organisms), once located on the surface of the Earth as part of an ancient oceanic plate. They indicate that these diamonds before they were carried to the surface, were in the mantle in very cold conditions for extremely short (on a geological scale), a period of time. It is known that diamonds get their yellow color due to the presence of single nitrogen atoms (so-called non-aggregated nitrogen defects) in the diamond structure. Thus, by studying such diamonds, we, scientists, create a scientific and methodological basis for diamond prospecting, - explains Dmitry Alexandrovich. Secondly, the root origin of diamondsįrom placers, including yellow diamonds is still not known. On this basis, the interpretation of their origin requires further adjustment. Why we took up the study of these diamonds? Primarily because of very limited study data. The largest diamonds are given names, and they are deposited in the Diamond Fund of the Russian Federation. The main Russian diamond-mining company also notes an increase in demand for yellow rough diamonds. So, for example, the cost of some intensely yellow diamonds sold at Sotheby's and Christie's auctions reaches hundreds of thousands of dollars per carat. These diamonds are round-curved crystals, they have a cubic form and a bright yellow color (yellow-green and dark orange were also found), says the geologist.Īfter a necessary processing, diamonds they often have additional value, because there are not so many yellow gems in the world. They are not very similar to those crystals that we used to imagine ourselves: a beautiful shiny transparent octahedron. Our work is devoted to the study of diamonds from the placers of the northern regions of the Yakut diamond-bearing province, where can be found a specific variety of yellow diamonds. Of course, it is impossible to drill well at such a distance, and thus, when studying diamonds, we evaluate the composition, structure, and evolution of those deep parts of the Earth, to which we cannot reach in any other ways, says Dmitry Alexandrovich. On the surface, they are carried out by specific kimberlite magmas, which are formed at a corresponding depth. For us, scientists, diamonds have a huge scientific value, no less than diamonds for 'high society.' The fact that diamonds are formed at a very great depth, of 150-250 km (there are deeper). He is also the leading scientific employee of the laboratory of experimental geochemistry and petrology of the Earth's mantle GGF NSU, who is currently a member of the SAU NSU named «Geological and geophysical research in the Arctic and global priorities». The first author of the article, the professor of the Russian Academy of Sciences, doctor of geological and mineralogical sciences Dmitry Zedgenizov told about it. ( Top : The 27.85 ct.The results of the research are published in the special issue of the authoritative scientific journal Lithos. The company said in a statement that the stone, which is 22.47mm x 15.69mm x 10.9mm, is of gem-quality and is nearly inclusion-free.Įxperts from the United Selling Organization of Alrosa and the company’s polishing division, Diamonds Alrosa, are currently examining the pink stone to make the decision of whether to auction the stone as a rough gem or cut it into a polished diamond.Īlrosa is the world’s largest producer of uncut diamonds in 2016, it produced 37.4 million cts. If the company decides to cut the mega diamond, it could become the most expensive polished diamond in the history of Alrosa. In the past eight years, Alrosa’s found just three pink diamonds weighing over 2 cts., and the largest pink rough diamond the company had ever unearthed weighed 3.86 cts. are rare in the deposits-they’re recovered only once a year or so. It’s a doozy of a discovery for the company, which is based in the Arkhangelsk region of Russia.

in its Republic of Sakha (Yakutia) deposits.

Almazy Anabara, a subsidiary of Russian mining company Alrosa, has unearthed a pink rough diamond weighing 27.85 cts.

Almazy yakutia russia