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The sapphire crystal is an extremely hard substance and although it's not entirely impossible to scratch it is extremely hard to scratch them unlike the plastic crytals they used to use. Sapphire can shatter if dropped at the right angle, but anything can break if dropped at the right angle.
Rolex started introducing the sapphire crystal in the seventies and by the late 80's to very early 90's they no longer use the plastic crystal on any of their watches. These crystals were a lot easier to scratch, but it was possible to remove light scratches with a bit of polywatch and elbow grease.
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