In this tutorial I describe several methods to design a ring and provide a site to look up the sizes and their metric equivalents. Since I have very fat fingers the size here is 11US.
The site is http://www.ringsizes.co/.
I hope you can use this tutorial to create your own unique rings in FreeCAD. This video will be a supplement to my upcoming FreeCAD 3D Printing 4 Kids: Volume 7-Jewelry ebook.
As of May, 2017 Phelps 3D has gone out of business. I am now doing just sales of my designs and eBooks through http://phelpscreations.win Thank you.