Here's a ring I just completed. It holds a strangely shaped stone that looks somewhat like a Superman emblem in a tension set. The diamond is very flat and the pointy end has no girdle to grip on like a conventional cut. The ring is made from aerospace grade titanium, and is cut from solid bar. It was a challenge to properly hold onto the stone since geometry was so strange. It took me most of the day, as I hand wrote the code and machined it one step at a time until it was done. It took a little had finishing, but that went pretty quickly.