I am the jewelry designer that did the ring for Michael, and Thomas Wittlesbach is also my friend! it is a small world. :) I do other jewelry this way too, at my site:
www.craigelliottcollection.com
I have another art site for my painting etc.
www.craigelliottgallery.com

I send the file to a company that uses Envison printers, they have a material that burns out of an investment mold and the ring is cast as a normal ring would be fromt here.
-Craig