I was shopping for this exact rug and hoping for a black and white colourway.
On the description of the rug, it does not mention the colour but the pictures do read as black. Upon calling the supplier, they said it is 'dark brown charcoal black'! In an effort to cover all bases.
The rug arrived and the pattern is definitely a very dark brown. I am still pleased with the rug and will be keeping it.
The delivery also arrived much sooner than they had originally projected. Which was great.