Apple Watch and Watch Sport — What are the differences between Sapphire and Ion-X Glass displays?

Apple advertises the Watch as having two distinct displays with the Watch Sport including an Ion-X display and the other models, the Apple Watch and Watch Edition, shipping with a sapphire glass screen. To be clear, these two materials do not comprise the entire display, but instead are the outer covers that protect the underlying flexible Retina display. Why did Apple decide to use two different display matrixes and what are the difference between the two materials? Read on to find out.
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