November 21, 2019 - ALROSA decided to keep the unmatched "diamond in a diamond" in its collection of rare finds. The collection already includes a skull-shaped and a football-shaped rough diamonds that the company mined in recent years. ALROSA's collection of rare stones is not for sale.
The diamond with another one moving freely inside it was discovered at the Nyurba Mining and Processing Division. The experts have never seen such stones in the history of diamond mining. Usually some parts of a mineral are replaced by others without a cavity. On the other hand, regular diamonds may have small gas-liquid inclusions. However, such large cavities have never been found in crystals before.
According to scientists, the Matryoshka diamond may be more than 800 million years old. Despite its complex structure, it weighs only 0.62 carats (0.124 grams) and has a maximum size of 4.8 x 4.9 x 2.8 mm. The internal cavity volume is 6 mm3 and the internal crystal’s volume is 1.6 mm3 with an estimated weight of 0.02 carats (0.004 grams). The inner diamond has a table shape and dimensions of 1.9×2.1×0.6 mm.
Scientists at the ALROSA’s Research and Development Geological Enterprise put forward various hypotheses of the origin of this diamond. To date, the most probable version is that both internal and external diamonds were formed at the same time.