The Symbol's Progression Sheet - All kinds of usefull data
This guide has no author, if you want to take ownership of this entry please contact Etaew
This spreadsheet helps you calculate how much resources you have left to get full stellar on a class (there are a field for each class and i will try and keep it updated when new classes are released).
There is also data for potential stats on gear and gems, also recommended stats, and gem power rank min/max per rareity and star.
To use it you need to download it to edit the item levels.
Thanks to Kukui for the color scheme.
(if you dont trust the link here it is in plaintext):