Many Russian sellers (especially in Urals) use the Russian color scale to describe the color of demantoids. It is not very convenient and not objectively
Russian color scale for demantoids has 5 gradations
I will try to make a comparison of the Russian scale and the scale of the GIA
Approximately, it could be like this:
Color 1 - Green - G
Color 2 - very slightly yellowish green - vslyG
3 - slightly yellow green - slyG
4 - yellowish green - yG
5 - yellow-green - YG
If it were that simple, It would be great!
The GIA scale also has a separation in saturation and color tone.
This does not apply to the Russian scale!
Indeed, the green is a slightly yellowish color can be "beautiful" and "ugly"
yG5/5 or yG5/6 - These are bright stones of medium-rich color - they are charming
yG5/2 or yG5/3 - These stones do not look spectacular and should have a lower price.
Very often, a light stone belongs to 4-5 color, and a dark stone to 1-2 color.
It is not right!
Color saturation is a separate characteristic.
yG3/4 or yG6/4
On the example of one stone you can see the possible combinations of saturation of color and amount of gray tint.
The white number on the stone indicates the subjective color in the Russian scale.
In the Urals, 1-2 color is considered the most expensive, 4 color is the cheapest
Thus, the Russian scale will not tell you anything about the true color characteristic of the stone.
When buying a stone, it is necessary to request a characteristic GIA color scale.
This is my personal opinion and I'll be glad to hear a different opinion or commentary