How strong is sapphire crystal on iphone camera lens?

When the lady was putting on my screen protector she was sliding the phone on it back and I was wondering what the chances of her scratching the phone where? The camera works fine and there's no marking on the edges of the phone from sliding on the table while she was putting on the screen protector. All answers are appreciated!

Sapphire crystal is believe to be as strong as thin piece of diamond so it think it wouldn't scratch that easy.

The use sapphire crystals for watch glass and it's pretty tough stuff.

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