Hello Sue,
My name is Jim and I own a service bureau in the Seattle,WA area
called JewelTech. I use ArtCAM, Solidworks, Rhino, and JewelCAD.
The easiest one to use and teach, IMHO, would be ArtCAM. ArtCAM
basically uses colors for different elevations of your piece. Of
course, it would really depend on what applications you were going to
use it for. There is really no one program out there that will do it
all. So you might want to be a little more specific, as to exactly
what you want to do with the program. If I can be of any more help
please contact me at 425-888-5144. Good luck. JIM