usayit
Well-known
sitemistic said:"Only diamond is harder than the sapphire glass used by Leica and Leica is the only camera manufacturer who has succeeded in using this material for the coverglass of their LCD screen. The advantage of a surface immune to scratches from contact with metal, stone or sand speak for themselves: an undisturbed, brilliant view on an LCD screen that looks new even after years of use."
Surface immune to scratches from metal, stone or sand. None of which imply brittleness nor materials "harder" than Sapphire glass. I've literally seen people take keys (metal) to their sapphire crystals with no problem. I would assume that stone (rocks) and sand will also be no problem.
BUT
It doesn't mean it will withstand a hammer ( METAL ) at full force.