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/me worries for a second about Pan's parts then smacks herself in the face with a stern "DONT GO THERE"
yeah, turning an interesting rock into a cabochon is an art form, and one which needs to develop over time. it takes a strong foundation in geometry, and being able to see the geometric range of a piece in 3D in your head before its done.
Many lapidary artists will work on making perfectly flat edges to their work, then taking the edges of that edge down on an angle. I have some examples here if you'd like to see what im talking about.
Its also easier to start with much larger pieces at first and work your way down to the size someone would use in a piece of jewelry, seeing as how manipulating a stone on a dop stick is a lot harder than holding the piece in your hands while you work on grinding and polishing it down.
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