My products do not fit into any one category. They are handmade jewelry items. I do not, however, make things that are jewelry store items. I make beaded and rock and wire wrapped and silversmithed items. Where do I list them?
Start in Amazon Handmade, especially since you are in fine jewelry that is a hard road on the commercial side.
I see you are already approved for the closed handmade forum. Ask this question on that side, your results will be better than here in the commercial forum.
https://sellercentral.amazon.com/forums/c/groups/handmade-community this link will work for you since you are approved.