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The gem kingdom

GEMS Desautels, Paul E. The gem kingdom. Random House, 1970
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The gemstone identifier

GEMS Greenbaum, Walter W. The gemstone identifier. Prentice-Hall, 1988
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Colored gemstones: the buying guide

GEMS Matlins, Antoinette Colored gemstones: the buying guide. Gemstone, 2001
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Gem identification made easy

GEMS Matlins, Antoinette Gem identification made easy. Gemstone, 1989
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