I was hoping people could answer a few questions for me.

Does the cost of the item(like jewelry) effect how much the enchantment does? Like a gold sapphire ring vs a copper ruby ring?

Is it defendant on the soul gem(Greater, Less, etc.)?

If none of the above, then how do I get the highest possible enchantment? I have a ring with +40% magica regeneration. I was hoping I could make a necklace with the same, but all is available on my enchanting list is 13% magica regeneration.

The actual output of enchanting is based upon perks, gems, and other modifiers (like potions).

Base item value is not important. Some enchants are dependent upon item slot (fortify alchemy can't go on a chest piece, etc.)

Are you suggesting that an enchant will be stronger on a diamond necklace than on a gold necklace?
My experience dictates otherwise, but I haven't experimented with it a huge amount. It'd have to be a pretty minor bonus (5% or less?)

Whats the highest Enchanted Necklace with magica regenerate? I currently have a necklace at 25% magica regeneration. Is there higher?

I actually testing the cost improvement of enchanting low cost items vs. higher cost items.

I notice that an iron dagger with an absorb health enchantment seemed to have a higher increase of value than say a elven dagger with the same enchantment.

So if you are trying to make a larger profit, cheap stuff with good enchantments are the way to go.

Its hard to say, the values can become odd numbers (29% and what not).

Are you at max enchanting? The effects are not always the same. Soul gems are at least static by their levels (grand are always best, and black gems just store grand as well). But fortify enchant potions can vary.

Also, at the other comment, I was actually saying the exact opposite. I've observed that item quality doesn't really matter, so gold necklace/diamond necklace is purely fluff. I imagine it does modify the final value of the item if you intend to sell.

No, I just want to maximize the Magica regeration of a necklace. Or Heavy Armor, I notice some of those non armor rated clothes have high enchantment, but I won't waste my time unless I can do it on heavy armor.

You can do it on heavy armor. But a word to the wise, mana regeneration bonuses from armor only seem to work out of combat. It's best to improve mana itself, as that produces a useable in-combat mana regen boost, since normal mana regen scales by pool size.

If magicka regen bonuses only apply outside of combat, that's pretty useless. I dont know either way, but i'd have to assume they apply in combat, perhaps only at a reduced rate.

This and I believe only this.

It modifies the value so it becomes very expensive.
But the actual enchant will not be any stronger on better stuff.
Why should it to start with. That makes no sense since the power of the enchant is a mix of your skil and the soul in the soulstone, not the item you are enchanting.

To get the best enchants you need to be highly skilled and have the necessary perks in the enchanting tree.

What do you mean scales by pool size?

Well in MW, items could only contain enchants of a certain "size," determined by how awesome the applied effect was.