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How can they claim that moissanite is “rare” when silicon carbide is a very common abrasive?

April 26, 2017abrasive Carbide claim common moissanite rare Silicon

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How can they claim that moissanite is “rare” when silicon carbide is a very common abrasive?

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Abrasives formed of silicon carbide powder are inexpensive to manufacture. Large single-crystal silicon carbide is extremely difficult to produce. Charles & Colvard have U.S. and international patent protection for moissanite jewels.