In another thread I mentioned the cut of a stone taking into account he refractive index of the gemstone material. In the US particularly, but around e world as well there are cutters the take pride in custom cutting. The results are amazing, as is the price! I'll let Uli Zeisberg explained it better than I can;
http://www.osirisgems.com/precision_cutting
Hear is what he did with some quartz
http://www.osirisgems.com/images/RauCit14.53_1.JPG
Hear are some US Links;
http://tucsongemshow.blogspot.com/20...wins-idar.html
http://www.johndyergems.com/awards.html