Coat your metal jewelry pieces with CerMark and let dry. Insert your first engraving piece into the system. You can use the upper left corner (factory home position) if you'd like, or you can change the home position and place your product anywhere on the table and engrave using Epilog's Center-Center engraving feature. If you'd like a visual indicator of where your design will engrave, draw a vector box (or circle) around the graphics and with the red dot pointer on and laser lid open, run ONLY the vector portion. When you are satisfied with the placement of the design, remove the vector box, and you're ready to engrave.
If you have a fiber laser, you can skip the pre-treating step, as these systems were designed for bare-metal marking. Just be sure to check your fiber laser user manual for recommended settings for your particular metal.