I recently converted an ilvl 29 item into a Tier II materia. I was wondering if the level at which items start to convert into Tier II was simply lower than 30. Today, I converted two Silver Rings of Crafting (ilvl 27), and got one Tier I materia and one Tier II materia.
I know I read somewhere they fiddled with the ilvl and %'s for T IV materia. I've converted half a dozen madman's rods and only received ele or piety in 2.0. I did one yesterday and got a crit IV......which I immediatly slotted into my Vanya robe :D
I recall being surprised the same day when I got a T III crafting materia from an awl I was sure would cap at T II. I don't remember reading about the lower tier materia but it's certainly possible, if not in the realm of 'confirmed'.