system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 If lab created diamonds are becoming cheaper than real diamonds and are a lot more durable than glass, why aren't things like watch glass and phone screens made from diamonds?
gpt
Lab grade diamonds are relatively cheap, but making one big enough to cover a phone screen would still be prohibitively expensive.

They are also not more durable than glass - at least not like you're thinking. It shatters instead of bending, even more so than glass.