Evidence continues to mount that Apple’s next-generation iPhone 6 will include at least a few big “firsts.” It will supposedly be the first new iPhone to include a larger display that actually benefits users (as we noted when reviewing the iPhone 5, the handset’s taller 4-inch screen didn’t really offer much of an advantage to users over the iPhone 4′s 3.5-inch panel). It will also likely be the first device to feature Apple’s new A8 processor as well as several other new key components. Beyond that, it seems more and more likely that the iPhone 6 will be the first mass-market cell phone to feature a sapphire crystal display cover — but where is all that sapphire going to come from?