The light and contrasts are just right and you've done a nice job with the symmetry and smooth yet clear composition. Odd to me that the gold overlaps the circle rather than the circle overlapping the gold. Not odd in a negative way, just different which is a good thing around here in my opinion.
Now this is a piece that makes you THINK! It's enigmatic in that it both jumps out and grabs you, while also displaying subtlety and masterful technique. I think it's greatest value lies in being a twenty-first century mandala. To keep it as a desktop for more than an hour or two is a frigtening proposition. I think that I would entitle it 'Division by Eights.'
It rates a '9' from me.