This was mined not far (at least by Siberian standards) from the Mir mine that hit the front-page [0] a couple weeks back. I started looking for anything mine-looking near Nyurba but couldn't find any likely candidates, I guess it's totally underground rather than strip-mined like Mir?

Also can't comment on a Russian diamond without bringing up the most oddly-named diamond I've ever found, the "26th Congress of the Communist Party of the Soviet Union"[1].

[0] https://news.ycombinator.com/item?id=22034055

[1] https://en.wikipedia.org/wiki/26th_Congress_of_the_Communist...

Edit: I believe I found the mine, 65°01'11.2"N 117°05'15.7"E