Recently, YouTube user Marques Brownlee uploaded a video where the front panel of the 4.7-inch iPhone 6 was put to several torture tests.
The crystal seemed immune to scratches with keys, metal objects and even a steel knife.
Now Brownlee decided to conduct another test on the display of the future Apple smartphone.
But this time he uses sandpaper and the Mohs scale as a grading mark, a criterion of 1 to 10 for the evaluation of the hardness of the materials.
The test is carried out with two different sheets of sandpaper: a garnet, certified 7 on the Mohs scale and emery, which is ranked slightly above 8.
It turns out that both are able to scratch the surface of the display that should equip the next iPhone.
It is therefore questionable whether the screen is actually pure sapphire.
At the end of the video the tested iPhone 6 display is shattered when pierced by an arrow.