I cuted the top of the ring to have a bigger base. Next, I deleted the top face.
With your bezel I took its base to have the octogonal curve.
On this curve I made a ReconstructCurve (10 or 12 points if I remember) to have a seamless curve.
With this curve I do a plane with the "Planar" function. I do it the use later the blend function.
Because of the initial Process used to do the ring, the top of the ring have 4 edges.
So I cuted the edge of the top planar to have 4 edges too.
To do this I used the trimming function (I used trim points to do it)
Now with 4 edges on the top of ring and 4 edges on the planar, I use the Blend function to have the 4 surfaces.
This gives us a soft transition between the planar and ring.
Join all and your ring become a solid...
You can next tune the size and the place of the bezel and the stone to have something as you wanted.