Some stone come from place far away and the cost to harvest the material and transport it around the world will affect the cost.
Some colors are more popular than others and have desire-able colors and patterns.
If a color is in short supply but the demand is high this can also affect the price for the slab.
Granite Strength: Some materials are stronger than others. Certain material that requires support and more handling may cost more due to these factors.
Slab granite countertops typically com in 3cm( 1 1/3 uinch) and 2cm (3/4 inch) thickness. 2CM is typically less expensive material but may end up costing more depending on the application. For instance 2 cm on countertops may require additional edge detail this will add labor costs. 2CM also may require a plywood backing material. This can add material and labor Costs. 3cm Granite Material does not require these added materials and labor.