Lapidary 101: How to Make a Cabochon – SUVA Lapidary …
How to Use a Trim Saw to Cut the Preform. A trim saw is a smaller tool that cuts away excess material until only a rough outline of the desired shape remains - the preform. Remember that you can't cut curved or bent lines - these saws only cut straight. To cut complicated or curved preforms you would need to use a Diamond band saw like the Inland DB-100.