This is a custom body for the "uranium" necklace by overflo from the hackerspaceshop: https://hackerspaceshop.com/collections/art-and-beauty/products/uranium
I did not order my pieces at shapeways but got them built on a SLM machine by my own. So I cannot guarantee this will come out correctly!
Also this is not a finished product when you get it, you have to cut 3 M2 threads on the bottom and get yourself a back board lasercut. More on that on the related Thingiverse page: http://www.thingiverse.com/thing:1624678/
If you want to read more about this design visit my blog: https://regendrogenbogen.wordpress.com/2016/06/13/uranium/