Hiii, first time sending a thought. Didn't find this one on the page.
Right now all gems and jewelry can be made while exploring or fishing without needing to open chests specifically, except for jade and jade charm. It would give different approaches a better chance to combat the jade MM and to work on jade charm later if unpolished jade would be added to some area that is explorable too, so that it doesn't always lag behind the others. Jade charm already is more intense to make than many other jewelry outside of that limitation. Some areas don't have a gem yet either :)
Thanks for the amazing game, just a thought as someone sent me this link in the game!