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submitted 14 hours ago by RandAlThor@lemmy.ca to c/science@lemmy.world

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[–] SaveTheTuaHawk@lemmy.ca 14 points 12 hours ago (1 children)

It's just aluminum oxide. It's not hard to make rubies, they are used all over industry.

[–] GreenKnight23@lemmy.world 1 points 5 hours ago

styropyro even made some with a high powered laser.