Quote:

As you know, it was recently brought into question whether or not the OnePlus One uses Gorilla Glass 3 in its displays.

We purchase our displays as a pre-built assembly from an extremely reputable supplier named TPK. Our display units use Synaptics touch panels protected by Gorilla Glass 3. Because we don’t buy the glass and touch panels separately, we aren’t a direct customer of Corning. This is actually a very common method of sourcing displays, and we certainly aren’t the only ones doing this.

This website was used as evidence to suggest that we don’t actually use Gorilla Glass 3 on the OnePlus One. You’ll notice some other notable exemptions from that list. Just as an example, a lot of Sony smartphones use Gorilla Glass 3, yet they are absent from the list in question. We don’t presume to know about Sony’s production methods, but it’s likely that they aren’t on the Corning list for the same reasons we aren’t.

source:

https://forums.oneplus.net/threads/in-response-to-the-gorilla-glass-3-rumors.200601/