40005019, Marlborough, 302, Portrait (profile left): Caracalla. Laureate head of Caracalla., Walters Art Museum, Baltimore, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), 42.1061, Sapphire, Early 3rd cent. AD

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