These delicate yet elegant 18k birthstone rings make perfect stackers. They have 1.5mm square stock shanks, and several can be lines up against each other, thus creating a family ring with assembled components. They also make great additions next to other rings, or stacked next to your OneFooter ring.
I’m currently out of Tourmaline (October), but should have some soon.
I’d be happy to make you a larger band ring with your birthstone! Or heck: with ANY gem!