PF2e - Manufacture of - Magical Rings & Tattoos

[aarcc]

Where can I find the rules or guidance re the manufacturing of magic rings or tattoos?

Is it possible for most self cast type spells to be invested into a ring or tattoo?

[BishopMcQ]

Custom magic items would be up to the GM. For standard magic items from the GM Core, Treasure Vault, etc. follow below:

Start with the Magical Crafting feat, then you learn the formulas of the items that you want to craft. The Inventor feat (not class) lets you design formulas rather than buying them.

Tattoo Artist lets you do magical tattoos and you learn a few formulas.