Quote Originally Posted by Mikita View Post
Goldsmithing usually provides slow but steady income.

High level HQ jewelry usually sells well for 2500 gil or more and is in constant demand for spiritbonding. It will take a long time to make a million gil, but since you can gather your own materials from Miner, aside from the time investment it's pure profit for you.

You can also make your own jewelry, spiritbond while crafting or doing DoW/DoM content, and convert to materia for additional income.
This, make your own HQ jewelry and SB them will be a better idea to make gil.