iPhone 6 sapphire cover (delayed launch)

Current example (Sept 2014) — Apple was going to ship the iPhone 6 with a sapphire cover and didn't.

[Tom shows a sapphire sample.] That's sapphire — aluminum oxide, just another form of aluminum oxide, fifth most abundant element in the earth's crust. The silicon is done at 1600 °C; sapphire is done at 2100 °C — it gets a little hotter, it's a bigger furnace. They make a boule about this big, which is worth about a hundred thousand dollars, and they cut it up into little substrates, just like the silicon for semiconductors. Anybody know what those Al₂O₃ sapphire substrates are used for? LEDs. Every little LED has a little piece of sapphire. They also use sapphire — [Tom indicates a watch face.] this is sapphire, that watch face. They were going to bring out the iPhone 6 with a sapphire cover, and they haven't done it yet, it's just a little too pricey to get something that big in sapphire. But it won't scratch. Why? Aluminum oxide, also known as corundum, is right below diamond on the hardness scale. Super hard, scratch resistant — it'll scratch almost anything else.