All the others in this group are synthetic. Bill estimated that it took about five hours to facet our first smoky quartz. It goes faster with experience. Even so, I heartily recommend that you find an experienced faceter like Bill to help you get started, and to share the joy in your triumphs. Seeking out an experienced faceter to help you through the first stone or two is definitely the best way to get started.
Clubs offering faceting classes and programs are ideal vehicles for getting started with faceting.