Match aggregate exposure and gloss on a sacrificial sample before touching the floor, then feather the transition without creating a bright halo.
Diagnose ridge cause and size first, then select scraping or dust-controlled grinding while treating dry sanding as a silica-exposure task.
Treat the seam as stone particles plus resin adhesive, control heat and flatness, and defer to the slab manufacturer and professional tooling.
Use optical distortion, coating, tempering, crack, and fingernail tests to decide between professional polishing and replacement.
Give a clear stop rule: edge grinding belongs before tempering, and an installed tempered shelf with a damaged edge should be replaced or assessed by a glass professional.