What material is used to make the Apple Watch face?

What material is used to make the Apple Watch face?

Most Apple Watch models feature a machined and polished single crystal of sapphire comprising the watch face. Sapphire is the hardest transparent material on Earth besides diamond.

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The Sport collection features Ion-X glass, which is chemically strengthened glass. Ion-x is impact and scratch resistant aluminosilicate glass, which has been strengthened by replacing smaller ions with larger ones to increase toughness.

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