Any gear (dated or not) will have a chance of producing T4 materia.
Rings appear to give random single-stat materias. My best so far is a +17 MND.
Add: Also Magic Potency and Parry
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Any gear (dated or not) will have a chance of producing T4 materia.
Rings appear to give random single-stat materias. My best so far is a +17 MND.
Add: Also Magic Potency and Parry
Rings typically produce Stat Materia, Tier IV max is + 18. Though there are certain rarer Materia that it can make.