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![Sapphire - Wikipedia, the free encyclopedia](https://www.iarticlesnet.com/pub/img/site/s_19.jpeg)
Sapphire - Wikipedia, the free encyclopedia
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日期:2024-08-25
They also may be manufactured for industrial or decorative purposes in large crystal boules. Because of the remarkable hardness of sapphires—9 on the Mohs ......看更多