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Key terms: ruby hues gemstone purple rubin silk laser corundum mineral inclusions sapphire transparency rutile myanmar sard rough mined synthetic rubies maiman spinel chromium precious hardness proverbs aluminium fractures imperfections heating process finest carat imitation violet cr spectral hues fusing national museum of natural history pigeon filling secondary hues premium theodore treatments emission red color verneuil impurities oxide natural rubies ruby laser powder Search external links cited by footnotes on Wikipedia page Ruby: |
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