If Apple really does take the wraps off an iPhone 6 with a sapphire glass display, it will be an even more impressive engineering feat than you think. MIT’s Technology Review has talked with a couple of engineering experts who say that sapphire is a particularly tricky material to work with and that Apple has very little room for error if it wants to use it to mass produce large smartphone displays. We already know that sapphire is much more expensive to use right now than the Corning Gorilla Glass that Apple has traditionally used for iPhone displays but it also has to be in virtually flawless condition before being used or else it becomes quite brittle, Technology Review says. “Any
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