Yes, ion-x is apple (and I guess the industries) best attempt at mimicking sapphire crystal. Its the best they can do to minimize the price on the watches but they’ll likely never replace it for camera lenses until they synthesize new glass tech.

at the end of the day, for even more peace of mind, you’d need something with a hardness scale of 9 to scratch sapphire crystal. So you’d basically need to be putting it camera down on sand paper (which includes materials like corundum—H9 hardness) to scratch it.

For even more reference/reassurance— sapphire crystal sits next to diamond on the hardness scale. Whereas even Ion-X glass sits a lot closer to quarts.

Basically the metal lining the camera and the back glass itself will scratch way before the lenses on the camera. Even putting your phone in a pocket or bag with keys will destroy the screen before you notice a nick on the camera lens

Hope that helps ease the mind. Also not to sub-nerd out on glass lmao, it’s kinda crazy how far we’ve come