Hi René. The image you commented on is a photo of an actual piece. This image, http://www.artmetal.com/images/dick_c/2009/10/computer_rendering_of_the_proposed_piece is a rendering done in Flamingo, www.flamingo3d.com , of the piece modeled in Rhino, www.rhino3d.com. The file produced by Rhino was sent to RJM Rapid Prototyping, http://www.rjmrp.com/main/ , where it was built on their stereolithography machine. I cast the piece myself. There is more information about it in this blog post: http://www.artmetal.com/blog/dick_c/2009/10/making_the_diamond_spangled_bangle