Where can I find which jewels are actually costly, sometimes I find rare items which should cost a lot but nobody reaches out, probably cuz it's early in the ladder?
Some people sell jools that go for 500-1000 FG.

Where can I find information about items of any type which can roll with the best/max stats?
Appreciated any help in advance.

There is no one resource. Only way is to follow the trophy room and you respective trade forum, ask price checks as you find items and learn that way.

The sad fact is that people that buy and more specifically sell such items, don't want you to know about it, because they want the market for themselves. So you have to be on it and price check every item.

I figured, yeah, thanks though.

here: https://diablo-archive.fandom.com/wiki/Affixes_(Diablo_II)
this doess not help you with price checks, but serves as an overwiev on which affixes can spawn with which roll for which level requirement

This post was edited by PiXi31415 on May 7 2022 04:22pm

Shoutout to whoever put together that wiki. Looks like a ton of work went into collecting all that info.

understand that items typically spawn with 6 stats (rares)

if you spawn 4+ of those stats as useful stats typically there could be some value to it

you need to know which stats are valuable on which items

And rich ppl, especially those who are in to PvP, care about its color too.

They might not want your GG jewel merely because yours is not the color they want