Green Item and Blue item?

I’m not new for this game, but there are something that I want to ask.
-What is “Green” bordered item and What is “Blue” bordered item?.
-Tell me the difference between them.

If u mean the backgroundcolor with bordered then the tier list would be:

white = common
blue = magic
rare = yellow
orange = epic
red = legendary
cyan = crystal affix on legendary
green = eternal ( 50% quality / crystals wont work except Jasper,Calcite and Garnet)
grenn with cyan affix = crystal eternal

You can also use topaz on eternal items, at least on Etetnal Fabled Blade and Helm.

I just sold my eternal item -_-

If you don’t need eternal and Crystal items converting is the best option then.