Thank you, I made it myself

[Ruvanal]

example: can use red and blue potions, and buy them; can use dropped small rejuvs; can not use big rejuvs unless made them in cube or found them by Find Potion

This should be in the same catagory as the Full Rejuvenation potions. Cube formula:
3 health potions + 3 mana potions + 1 chipped gem -> rejuvenate potion

for the Full Rejuvs there are 2 formulas:
3 health potions + 3 mana potions + 1 standard gem -> full rejuvenate potion
3 small rejuvs -> one large

edit: also this formula would ve very useful very early in the game:
3 chipped gems + 1 magic weapon -> socketed, magic weapon