This calculator shows the maximum probability of achieving a completed stone that satisfies all chosen minimum and maximum values. This probability is only accurate if you select the calculator's optimal choice at every step. For basic usage:

1. Select rarity tier (number of slots per line).
2. Select target values for each line.
3. If your stone already has filled slots, facet the grid to match it using the hammer buttons on the right.
4. Click the Start button to begin calculating probabilities.
5. Each hammer shows the maximum probability of achieving the goal if you facet that line next.
6. Record the in-game outcome (success or failure) after clicking a hammer.
7. Repeat (5) - (6) with updated probabilities.

For example, clicking Start with the default settings shows that there is a 4.81% chance of ending up with a 7+/7+/4- ability stone if you choose line one first, but only a 2.86% chance if you choose line three first.