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Author: WikiMatrix
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English[en]
Natural rubies are corundum (aluminum oxide) crystals that are colored red (the rarest type) due to chromium (III) ions (other colors of corundum gems are termed sapphires).
Indonesian[id]
Rubi alami adalah kristal korundum (aluminium oksida) yang berwarna merah (jenis paling langka) karena adanya ion kromium(III) (permata korundum berwarna lain disebut safir).