Is the iPhone 6 display made of sapphire? [VIDEO]

Journalists and tech writers around the world have been considering the prospect that the next iPhone(s) will have sapphire screens to make them extremely durable. It is assumed that these screens will no longer succumb to the negative connotations often associated with glass in mobile phones.  By now, many have also made the assumption that Apple’s massive collection of furnaces in an Arizona facility was created for the sole purpose of making such a screen in large enough quantity to be one of the “killer features” on the iPhone 6.

Does this video by MKBHD provide you with enough proof that this is exactly what Apple is up to?  Or are you taking a wait-and-see attitude for now?