APPLE has spent more than half a billion dollars developing a sapphire crystal screen for the iPhone 6 that won't scratch even when rubbed against concrete, according to the latest reports.
Sapphire glass is around 2.5 times more durable than Corning Gorilla Glass which is utilised in several smartphones in the market today, reports International Business Times. "The sapphire glass can simply break pieces of concrete leaving no scratches on it," it says.
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