Well the PVD process was used for the back of the Iphone 11 pro. Can sapphire be applied thru the PVD process?
An array of support equipment rounds out the facility’s robust operations, including waterjets, CNC, riveting, insert molding, polishing, PVD and sandblasting.
This was from the Yihao partnership announcement a little while after the Apple event was done. Coincidence maybe maybe not.