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>> No.15194542 [View]
File: 19 KB, 474x335, slab.jpg [View same] [iqdb] [saucenao] [google]
15194542

>>15194385
Sapphire (monocrystaline Al2O3) is better for something like that.
Almost the same hardness as diamond, but we can grow it in huge slabs.

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