With increasing evidence that Apple plans to replace Gorilla Glass with sapphire to protect the screen of the iPhone 6, it’s interesting to watch a video demo of just how scratch-resistant the material is.

Screen protection company Aero-Gear scrapes a concrete block across the screen of an iPhone 5 fitted with a sapphire protector. Assuming the video is genuine (the camera angle hides the actual scraping), it’s an extremely impressive demonstration of what we might expect from a sapphire-coated iPhone 6 … 

We’ll have a lot more on Apple’s sapphire aspirations in the coming days in a series of special reports.