Procedural Granite And Mosaic Material.
There is a special YT video for this material - https://youtu.be/B8iPHdqudaU
Granite node
- There is already pretty realistic texture, so you only need to change color or saturation
Mosaic node
- Just open mosaic preset material and drag any of this sliders to understand what are they doing, this is really easy. Or wait for the video;)