if you used nurbs there are a couple of options.
1 convert to polys then use darkwares method.
2. keep the nurbs and create the text and project the text curves onto the ring - trim the surface to delete the area of the ring surface that is the text - duplicate the projected text curves twice, move the second duplicate back into the ring ad loft between the two duplicated curves.
I ain't very good at explaining things - as you might have gathered
I would go with darkwares method