A Ring created from Volumetric Patterns. This ring was created using ShapeJS and it's an 11.5 US sized ring. If you want to make your own then try out this example:

http://shapejs.shapeways.com/ide?shapeJsScript=/rrstatic/javascript/shapejs/examples/volpattern_ring.js

We also have a tutorial on how the code was made here:

http://www.shapeways.com/blog/archives/24592-learn-shapejs-volume-pattern-ring.html