In 2013 Apple signed a $578m contract with GT Advanced Technologies, a company that processes the sapphire.
9to5Mac and analyst Matt Margolis have discovered documents that indicate the purchase of a significant amount of equipment dedicated to the production of sapphire.
GT Advanced has purchased 518 sapphire furnace and chamber systems to produce synthetic sapphire.
These machines can produce between 103 million and 116 million 5-inch screens per year.
A second order was placed for 420 additional machines, which would almost double the production.
In addition, multiple “Sapphire Display Inspection Tools” have been purchased from Intego.
With the new machines ordered, production could reach a rate of 200 million sapphire displays per year.
Matt Margolis recently speculated that the iPhone sapphire display could be combined with solar cells in order to increase the smartphone’s battery life.