40004954, Marlborough, 750, Portrait (profile left): Augustus. Laureate head of emperor Augustus, Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 750, Octagonal, Beryl or pale sapphire

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