@sgtstretch If you look at the tech specs it shows the crystal is sapphire. It’s one of the reasons the stainless version is so much more $$. I had the stainless series 4 for 2 years and it held up great working in a warehouse. For the series 6 I got the blue aluminum one. Screen is scratched all to heck. Looking forward to a stainless 8 this year.