Looks like 5 or 6 sides to me. And it looks like it twists 360°
What I'd do, is draw the profile. Then do a polar array of the profiles around the axis through the center of the ring, so that you have a profile every 30°. Then rotate each profile 30° in the same direction, so the start points of each profile are offset 30° to the previous profile. Then try lofting them.
You might have better luck lofting halves, then joining the two halves.