Ring with colored inset

Inner diameter is 16.7mm which is about a US size 6-¼.

I've designed the inset to be “offset” what I consider a pleasing amount. I started with a golden ratio but found it was not a noticeable enough offset. I increased the offset until it was noticeable from a distance, and looks "intentional". 

Fusion f3d file is fully parameterized so you can change it to any size and ratios you like.