The uncertainty about iPhone 6 availability this fall is largely centered around one component: sapphire. The ultra-durable material is rumored to be in not only two new iPhone models this fall, but the iWatch as well.
Apple’s only sapphire partner is GT Advanced Technologies with a relatively small operation in Arizona. According to another report, GTAT’s sapphire production, particularly for the 5.5-inch iPhone 6, will he heavily constrained until 2015.