According to the patent images, zirconia can be used for the back of the iPhone. The matte finish could have been on older Pro/Pro Max models.

Why is zirconium used? It is quite durable, scratch resistant and looks good. It has one major flaw. This material is expensive. First, it could make iPhones even more expensive, and second, it could force Apple to use impure metal.

Source: Ferra

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