Placio (atys)
Crafting skills split into many branches, but you skill get the craft action of your highest achieved lvl in that branch. For example if your earring crafting is lvl 190 you can craft q200 earrings. You can use the same q200 action to make anklets even if your anklets are at q150. The difference is overcrafting and gives additional xp because it is more difficult to make q200 if your skill is only lvl 150.
Probably the shortest, simplest description and yet completely accurate.
Overcrafting is why my Bracelets, Heavy Vest, and Staff crafting skills are 50-60 levels higher than any of my other crafting skills in the jewel, armor, and weapon branches. I did it that way so that whenever I craft any jewel other than a bracelet, any armor other than an HA Vest, or any weapon other than a staff, I get the maximum XP possible; up to 300XP per mat used if I am lucky enough to not degrade too much.
Getting nearly triple the XP (on average) saves a lot of time too, mostly since one does a lot less digging for the same number of levels.
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