Emmett, J. L., Stone-Sundberg, J., Guan, Y., & Sun, Z. (2017). The Role of Silicon in the Color of Gem Corundum. Gems & Gemology, 53(1). Link to Article
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Emmett, J. L., Stone-Sundberg, J., Guan, Y., & Sun, Z. (2017). The Role of Silicon in the Color of Gem Corundum. Gems & Gemology, 53(1). Link to Article