So I made a mistake when melding my materia today. I put in a skill speed when i meant to use spell speed.
I thought "oh i can just remove it and put something else in" wrong.. when trying to remove materia it removes all materia on that piece. With this being the 5th meld outta 5 expensive materia, it is not worth it to remove it and resocket it all.
There should really be a option to pick and choose which materia is taken out.