How Does Crafting Xp Work?

Ok so i am considering getting my professions up soon, even though once gathering XP comes out it wont matter anymore. And i was just wondering something about how xp gotten from crafting works.
So if you craft an item with no ingredients, it doesnt give a ton of XP. Including even T1 ingredients in your crafting can make them give much more XP. But i was wondering if the materials you use effect the xp you get.

Let me give an example, let's use food for this case.
If i make a food item using 6 dried gills using level 15-17 materials such as Trout and Barely grains, will that give me the same amount of XP if i used say, Dernic materials?
Also, does the tier of my materials effect the XP gotten? If i were to craft something with tier 3 materials, will that give me the same amount of xp as with tier 1 materials?

 

Better tier does effect xp, but not by a huge amount.

dernic materials will also give considerably more xp. also, dried gill is lvl 15, using something higher should yield more xp

also apparently necklaces give more x than rings

 

That's because necklaces take more mats to make.

 

There was a thread asking about the formula for crafting xp a bit ago, so I just copy-pasted my answer from there. Note that there's no real known formula for crafting xp and all is speculation.

Spoiler: that answer

First off, there's a base material xp-range you get when you craft something. This amount is the same for all crafting professions at their levels but keep in mind that for scribing and jeweling you have different amounts of materials you use when crafting.

Each ingredient you use adds an additional xp-range to this base. Each ingredient does so seperately, it doesn't matter where it's placed in the crafting grid and ingredient effectiveness doesn't effect it.
Each ingredient also has a seperate xp-range it gives. As a rule of thumb I Always say that 1 star = 10 levels of xp. But that's not really all that accurate. Two lvl 70 ingredients with 0 stars would still have a different xp-range they add to the base.

The crafting guide from SmileAndWaveBoyz which has been linked above says that better materials work multiplicatively, and from what I've seen, I agree. I think that T3 mats give a little less than 5x the xp. But never tested that.
He says that, when it comes to materials, 1 t2 craft = 2 t1 crafts and 1 t3 craft = 5 t1 crafts worth of xp. So the material multipliers would be:
T1 mat = 1
T2 mat = 2
T3 mat = 5

The same trend holds up when crafting for scribing and jeweling, but the amount of XP is noticeably different if you use more or fewer materials. It's suggested to only level scribing with the crafting of necklaces.

So the formula would be:
(basemat xp for the lvl range + ingredient xp (seperate for each ingredient you use.)) x material multiplier = totalxp

For example, making this potion with xp-ranges completely made up:
basemat xp lvl 1-3 (or also quite likely to be 1-9) = 8-12xp
ingredient xp brown mushroom = 2-4xp
ingredient xp red mushroom = 2-3xp (x4 = 8-12xp)
ingredient xp royal cake slice = 30-38xp
T2 mats --> material multiplier = 2

so totalxp = (8-12 + (2-4 + 8-12 + 30-38) x 2 = 48-66 xp.

Again, these numbers are just what I guess the ranges would be for the ingredients, and the xp-ranges ingredients have are kinda like the amount of durability they take away. Although there's a correlation between their level and the amount of stars they have, and probably even a baseline, it differs between each ingredient.

TL;DR as a rule of thumb, each star on an ingredient is ~ 10 levels worth of XP, there are a few exceptions. Use ingredients closer to your level and with more stars with higher tier materials and never craft without ingredients when crafting for xp.

As for the question

my (theoretical) formula is: (basemat xp for the lvl range + ingredient xp (seperate for each ingredient you use.)) x material multiplier = totalxp
So:
1. No, the basemat xp for dernic materials is much higher. But once you use dernic materials, leveling with lvl. 15 ingredients is basically the same as trying to reach lvl 106 using lvl 15 quests and miniquests. So for xp you want to use higher lvl ingredients. The basemat xp is way less than what you should get from the ingredients.
2. The tier effects the xp gotten, see: material multiplier in the quote.