African diamond firms on COVID-19 response, recent developments

Rough & Polished recently contacted several diamond producers and exploration companies with operations in Africa to establish how their operations were affected by the Covid-19 pandemic and what they are doing to alleviate the impact. We also sought...

Yesterday

“Get Diamonds” platform will soon be available in Russian, Hindi, Arabic and any other languages as per demand from any countries

A first-generation diamantaire Yoram Dvash, currently serving as the Acting President at World Federation of Diamond Bourses (WFDB) and the President of the Israel Diamond Exchange (IDE), launched his diamond manufacturing and trading...

25 may 2020

Sustainability is the only way forward - Rahul Jauhari

Rahul Jauhari, Sr Vice President of Global Sales & Marketing, Star Rays, has forged ahead professionally for more than 14 years garnering experience in Business Development, Luxury Lifestyle Consultancy, Market Analysis, Global Fashion / Luxury trend...

18 may 2020

Keeping global supply chains functioning vital – De Beers

Diamond giant, De Beers has said that it is essential to keep global supply chains functioning in view of the substantial impact of Covid-19 on the industry. Group spokesperson David Johnson told Rough & Polished’s Mathew Nyaungwa in an exclusive interview...

11 may 2020

Gabon courts foreign investors to grow fledgling diamond sector

Diamond production in Gabon, which has been a member of the Kimberley Diamond Certification Process since 2018, is currently dominated by artisanal miners. The artisanal miners are producing about 300 carats per month, according to Gabon’s director of...

05 may 2020

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.

news_04102019_matryoshka.jpg
                                   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."