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I know very little about the identity of stones,,, I just know that I like learning about them , as guys post them.
Good quality photos of all sides, maybe a few slurry shots, always help. A close...

The only reason I pulled this joke was to lead aa1192 a ways down the silly path, for posting a single pic in the OP that looked like it was taken with a Secret Decoder Ring. :shrug:

The follow-up...

Vasilis,,,,,, it's the stone in the OP ,,,,, the photo that no one can tell what the heck it is,,,,,, look at the words above the photo.
It's a joke,,,,,,,,,

It's a grey Badesdone finisher,,,mined in Eastern Europe, around 15K to 18K. Not as rare as an Echer, but quite a good stone. Hopefully you got it for a good price. Thanks for sharing it. :D