This a very simple ring design based on a few basic geometric shapes, originally made for the purpose of testing stone setting sizes. The finished rings are much like a signet ring design, and polish up nicely for a softer feel. Unpolished, the ring has a more angular feel.

Two ring sizes are included, both with and without stone settings. Resizing the ring with a stone setting is more complicated than simply scaling the ring to the appropriate size, as the stone setting will change. I've included a Blender file which should allow you to adjust the size of the rings and maintain the correct size for the stone setting.