藍寶石和紅寶石都是激光材料。藍寶石很硬，僅次於金剛石，恐怕不容易打磨。手機屏幕，用的藍寶石。黑金剛，可能比金剛石還貴。

來源: 馮墟於 2023-04-19 13:43:01 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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