Im still playing this for at least 1/2 year and idk how to get that blue items all i have were eternals pls help
Red items are legends, green are eternal, cyan have a crystal affix on them (obsidian), purple have a mythic applied to them… colours go like this green>purple>cyan>red so you might have an eternal with crystal affix (rare and cannot be edited) or you have applied an obsidian to an item with a mythic on there
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Yes use an obsidian on your item. But beware once you do it then the effect is permanent
I think higher luck will increase your chance of non Legend/Eternal items having a Crystal affix. in the time it takes me to go from using one Legend map to getting my next Legend map, I have gotten 0-3 items with a Crystal affix. I don’t include Legend/Eternal items here because they seem to have a lower chance to have a Crystal affix as a normal item. my luck is at 550 for now and working good enough. also, I am on mythic 3 difficulty, which also gives me a luck boost, with the Fortunate Perk. well, now that I look at it, that is where all my luck is coming from. 
and as @dickwad said, you can use the Obsidian crystal to put 1 permanent affix on an item.
if you use dust to get Legend/Eternal items from the Codex, they have a chance to have a Crystal affix too.
I can’t remember if items bought in the shop have a chance to have a Crystal affix.