Apple patents zirconia iPhone

Journalists have discovered an Apple patent describing the design of the future iPhone and Apple Watch. The company plans to make

zirconium-based housing devices that will have a matte surface.
Discuss

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

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Why use zirconium?It is quite durable, scratch resistant and looks good. It has only one major flaw. This material is expensive. Firstly, it can make iPhones even more expensive, and secondly, it can force Apple to use non-pure metal.