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What is sapphire crystal?

crystal sapphire
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What is sapphire crystal?

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Crystal refers to the see-through window above the dial of a watch. A sapphire crystal is indeed made of synthetic sapphire, which is a transparent form of corundum, or aluminum oxide (Al2O3). It is extremely hard (Moh’s scale 9), and will resist scratching by most substances short of diamonds. However, if struck sharply and from the correct direction, sapphire will shatter.

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