I will note that the Time article (linked above) says:
Quote:
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To achieve anti-reflection with sapphire, it has to have a coating applied which, over time, will wear off.
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Which seems to be complete BS. The sapphire lens on my watch has anti-reflective coating (both sides) and has zero signs of wear after 15+ years of daily use. This is the most durable surface finish I have ever seen.
And, when clean, it often appears that the lens is missing.