When faceting a slab of glass with the carbide tipped chisels very sharp glass chips of varying size are produced often flying off of the block of glass with considerable force.

IT IS IMPERATIVE THAT EYE PROTECTION, WITH EITHER HIGH QUALITY SAFETY GLASSES, GOGGLES OR A FULL FACE SHIELD BE USED AT ALL TIMES. 

I wear safety glass whenever I work with glass ( sawing, grinding, soldering, cutting and faceting ) When I facet glass I also wear a hat since chips tend collect in my hair, a shirt that I only wear in my studio since glass chips may lodge in the cloth and then if the shirt is worn elsewhere the chips may end up in an unwanted location,  a fairly heavy rubber apron which protects me from the chips ( covers my pants ) and keeps me dry when I use the water cooled saws and grinders and boots the tops of which reach above the bottom of the apron which keeps the chips away from my socks. I never wear the shoes or boots that I use in the studio outside of the studio. Even with all of my precautions, unfortunately, glass chips still tend to migrate outside of my work space.

On a number of occasions the flying chips have caused minor cuts on my hands so if you are concerned you can wear work or kevlar gloves ( I sometimes use the kevlar gloves sold in sporting good stores intended for filleting fish ).

The substantial amount of glass dust ( discussed in a separate  post ) generated when cutting and sawing the dalles tends to be ubiquitous so when sweeping up the glass chips ( which should be done frequently ), the area to be swept should initially be sprayed with water in order to reduce the possibility of the dust becoming airborne.