a color grading scale used in the trade, by Argyle Diamonds, from Australia, for grading brown-colored diamonds: C1, light champagne; C2, champagne; C3, medium champagne; C4, light cognac; C5, medium cognac; C6, cognac; and C7, fancy cognac.
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© 2009 Springer-Verlag Berlin Heidelberg New York
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(2009). C1, C2, C3, C4, C5, C6, C7. In: Manutchehr-Danai, M. (eds) Dictionary of Gems and Gemology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-72816-0_3255
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DOI: https://doi.org/10.1007/978-3-540-72816-0_3255
Publisher Name: Springer, Berlin, Heidelberg
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