Demand will pick up once the season starts

N Anantha Padmanaban took charge as the Chairman of the All India Gem & Jewellery Domestic Council (GJC) in January 2019. He has immense hopes and confidence in the Indian jewellery sector. His motto is to ‘ensure that after the day’s business...

14 october 2019

Prospects for discovering new diamond deposits in the Arkhangelsk Province are far from exhausted

ALMAZINTECH is engaged in technical auditing and comprehensive assessment of activities performed by exploration, diamond mining and gold mining businesses in Russia and other countries, as well as carries out research and development. It employs highly...

07 october 2019

Botswana Diamonds eyes expansion of Thorny River to include Marsfontein – Campbell

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30 september 2019

Diamond knife and tender system: The tight-fisted paying twice?

LLC Kristalin is the only company in Russia that manufactures microsurgical diamond blades for domestic healthcare that meet international requirements and are used in ophthalmology, neurosurgery and plastic surgery. Mikhail Zhiltsov, the company’s Deputy...

23 september 2019

Didier Giard: Stiff competition among the diamantaires is one of the factors of the price war

On September 9, 2019, the French Association of Gemmology (l’Association Française de Gemmologie, AFG) held its regular Paris Gemmological Rendez-Vous. Its organizer, Didier Giar, the head of the AFG kindly agreed to answer questions from Rough&Polished...

16 september 2019

Matryoshka diamond found in Yakutia

04 october 2019
An unusual diamond with another diamond moving freely inside was mined in Yakutia at the Nyurba mining and processing division of ALROSA. Due to its peculiarity, the stone resembles a traditional Russian Matryoshka doll. According to the experts who have studied the find, this is the first such diamond in the history of global diamond mining.

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                                   Image credit: ALROSA

According to scientists, diamond may be over 800 million years old. Despite its complex structure, it weighs only 0.62 carats (0.124 grams) and has maximum dimensions of 4.8 x 4.9 x 2.8 mm. The internal cavity volume is 6 cubic mm and the internal crystal volume is 1.6 cubic mm with an estimated weight of 0.02 carats (0.004 grams). The inner diamond has a tabular shape and dimensions of 1.9×2.1×0.6 mm.
Specialists of the Yakutsk Diamond Trade Enterprise discovered this unusual diamond during a sorting process. They handed it over to the Research and Development Geological Enterprise of ALROSA. There it was studied using several methods, including Raman and infrared spectroscopies, as well as X-ray microtomography. Based on the results of the study, the scientists made a hypothesis about how the crystal was formed. According to them, there was an internal diamond at first, and the external one was formed during the subsequent stages of growth.
"The most interesting thing for us was to find out how the air space between the inner and outer diamonds was formed. We have two main hypotheses. According to the first version, a mantle mineral captured a diamond during its growth, and later it was dissolved in the Earth's surface. According to the second version, a layer of porous polycrystalline diamond substance was formed inside the diamond because of ultra-fast growth, and more aggressive mantle processes subsequently dissolved it. Due to the presence of the dissolved zone, one diamond began to move freely inside another on the principle of matryoshka nesting doll," said Oleg Kovalchuk, Deputy Director for innovations at ALROSA's Research and Development Geological Enterprise. - As far as we know, there were no such diamonds in the history of global diamond mining yet. This is really a unique creation of nature, especially since nature does not like emptiness. Usually, some minerals are replaced by others without cavity formation."