The iPhone 6 could feature sapphire glass display that doesn’t scratch even if concrete is rubbed on it, as Apple put half a billion dollars on the technology. Currently, sapphire glass is already seen on the Touch ID home button and the lens cover of the iPhone 5s, but it is rumoured that the whole display of the much anticipated iPhone 6 will be turned into sapphire glass that can handle a significant amount of abuse.

Practically everyone reading this will have heard the reports about the lengths Apple will go to in order to ensure that its products are on the cutting edge of industrial design. Well, to those reports you can add the one which suggests that Apple recently paid a total of $578 million — more than half a billion dollars — to GT Advanced Technologies to speed up “the development of its next generation, large capacity ASF furnaces to deliver low cost, high volume manufacturing of sapphire material.”