From my understanding, Each Earring has 2 "Positive" Stats possibl, one of the "Main" Element, and one of the "Sub" Element.
So far this rule holds true that, the main element has a cap of +2(STAT)
and the sub element has a cap of +1(STAT)
Attack,MP,accuracy,M.acc,etc seem to have seperate caps, and i believe Light Elements have HP+ and enmity- unique to them, while Dark Elements have MP+ and Enmity+unique to them, capping of unknown values.
Btw this is only with the Earrings, this rules does not hold true to any other augmented item
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