A factory that will manufacture parts for Apple is close to opening in Arizona.

GT Advanced Technologies CEO Tom Gutierrez told investors last week that the 1.3-million-square-foot plant in Mesa is nearly finished.

The company will produce scratch-resistant sapphire glass for the next generation of Apple devices.That glass is used to cover lenses on its iPhone 5 cameras and fingerprint reading devices.

Gutierrez said the plant will be at a full production capacity in early 2015.

Around 700 employees will work at the facility.

The Associated Press contributed to this report.