As products of nature, dimension stone will have inherent variation in color, shade, and character, including marking and veining, throughout any given lot of material. Variations from piece to piece are characteristic of the material and acceptable.
-TCNA Handbook 2021
That being said, The advancement of printing technology has helped the range of shade variation to be more consistent in their categories. We like to stick to 4 shades which would be Uniform V1, Slight V2, Moderate V3, and Random V4. Having these broken up helps the customers differentiate the style and look they desire.