What's The Difference Between Tier 1 - 3 Of The Crafting Materials (ex. Granite Ingot)

It has no discernible effects, besides not stacking between tiers

 

more stars have better stats when u make stuff out of them

 

Higher-tier materials give more duration or durability, more damage or health on weapons and armours, and better base effects for unmodified consumable recipes(more healing).

Not 100% sure about the consumables getting better healing, but it would make sense.

 

Do you get more xp when crafting with higher tier materials or ingredients? Would a lv10 ingredient give more xp than lv1 ingredient?

 

if it's a 0 star level 10 and 3 star level 1, then the level 1 probably gives more xp