Don''t go smaller than 1 pointers. I have a halo ring almost just like this. I''ve attached a pic of the side view. It may seem thick, but trust me, it is very delicate, yet sturdy. It won''t be too thick for you.
I posted in the other thread but just to reiterate, stick with the 1 pointers, don''t go less. The CADs and even waxes can be a little deceiving about scale, so no worries yet.