I understand (conceptually) the differences in various levels of granite. My question is more about the difference in pricing from one level to the next. I'm not looking for actual numbers, but how the levels relate to each other, if at all. In other words, what is the incremental price difference between levels?

Here's what's behind my question: Granite for my kitchen remodel was budgeted at Level 3, or $50/SF. The way it turned out, I chose one granite that's a Level 2 for a small area, and another granite that's Level 5 for the much larger area. The Level 2 was priced at $45/SF, not much less than the Level 3. The Level 5, however, was priced at $85/SF. Is there any relation between pricing at various levels?