Maker - Alchemy Skill FAQ and Walkthrough

here's how grading works:
You get 10 ores. You go to the NPC and make a refined gem, for our example let's use Diamond. So, you now have this refined Diamond. You use your Maker skill to open up the UI, then select Jewels from the leftmost dropdown list. You then move to the rightmost dropdown, and pick out your specific jewel, in this case Diamond.
You then pay 100,000 mesos and use the skill. It will run the little progress bar, and when it's finished, your jewel will be graded.