I am no expert, but I did purchase a 3/4 J. Mendel Barguzin sable coat a few years ago. It is in a medium greyish or ash brown. I wanted that color because I already have a black Dennis Basso mink. It's my understanding that although the most expensive Barguzin sable is near black with a blueish caste, Barguzin sable comes in a number of colors. The number of silvery hair affects the price almost as much as the color of the fur.
Check out the professional sable pelt seller easyfur.com to see the variety of colors available in Sojuzpushnina Barguzin. Looking at the full pelt Without the distraction of fashion or a person wearing the coat gives a better idea of the true color.
https://easyfur.com/search?sSearch=barguzin&p=1