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      Knowledge is Power

      Scientific American July 16, 1921

      Man-Made Precious Stones

      Efforts of the Past and Present To Produce Synthetic Rubies, Sapphires, and Even Diamonds

      • By C. M. Lewis on July 16, 1921

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      More in the July 16, 1921 issue of Scientific American
      • Drying Wood in the Orient, Helping the Automobile Out of Sand with Chicken Wire and more
      • Putting Green Sand to Work
      • The President's Great Opportunity, Tremendous, The State's Duty to Its Barge Canal
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