Stones are often categorized by numbers such as 1, 2 or 3. These numbers pertain to their color variations.
- Limited color variation: Relatively uniform in background / field colors, veining and/or movement.
- Moderate color variation: Background color has some variation and veining / movement variations may appear. Inspection / blending prior to installation is suggested.
- Extreme color variation: Background color has significant variations and contrasts. Veining variations movement may be inconsistent. Inspection / blending prior to installation is strongly recommended.