As a natural product, Indiana Limestone contains at least few distinguishable calcite streaks or spots, fossil or shell formations, pit holes, reedy formations, open texture streaks, honeycomb formations, iron spots, travertine like formations, and grain formation changes. Grades are how grained a stone is, determining how much of these characteristics will be noticeable on the final product.

Standard: Fine to moderately large-grained stone permitting an average amount of characteristics.

Rustic: Fine to very coarse-grained stone permitting an above average amount of characteristics.