Level 1: Granite is the most affordable tier of stone. It has very little movement with the veins, giving it a more consistent pattern of color throughout the slab. Due to the consistency of the color, it is easier to get more pieces out of every slab.

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Level 2: Granite is slightly more complex. It has more movement with the veins, with a more dynamic color scheme. These stones and are slightly more challenging to fabricate.

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Level 3: Granite includes very rare stone. The movement of the veins is more drastic and the colors are much more vivid. These are very labor-intensive to fabricate since they require a lot more skills.

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Level 4&5: Stone in these levels are considered exotic. The colors in these levels are usually more rare and have unique qualities that contribute to it's overall beauty. These are usually the trickiest to fabricate. 

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The categorization of levels varies a bit by suppliers and fabricators. Higher levels are rarer and generally more expensive.