I have a piece of coral i want to shape into a heart without breaking it. I have hear using a dremel with sandpaper blades would be best, but i want to make sure i don't waste time or money.
Dremel goes much too fast and is much too hard to control. Glue sandpaper to popsicle sticks and sand by hand. Or just lay the sandpaper on a table. Don't worry about wasting time, just concentrate on doing a good job. Go to google.com and search "how to polish cabachons" to see what you can learn.