I have goldsmith that just hit 50. Tried to meld intelligence materia into scepters and rings for my black mage (lvl 43), but kept getting the message that the item's potential was too low for the materia.

Out of curiosity I tried to attempt melds with other things in the armory chest, and the only thing that accepted the intelligence materia was a pair of spectacles.

Do scepters just not take intelligence materia? Apart from spectacles, what takes intelligence materia?