Apple's Ion-X glass beats out the sapphire crystal glass in several categories in DisplayMate's Apple Watch testing
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Apple Watch and Watch Sport -- What are the differences between Sapphire and Ion-X Glass displays?
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How scratch resistant is the sapphire crystal on stainless steel apple watches? My aluminum series 5 (ion x glass) has gotten quite scuffed up and I'm thinking I might want to get
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Ion-X Glass vs. Sapphire Crystal: Apple Watch Sport brighter, easier to read than Apple Watch - MacDailyNews
