40004666, Marlborough, 621, Eros asleep on rocks, a butterfly (Psyche) beside him., Unknown, Boardman, J., Scarisbrick, D., Wagner C., Zwierlein-Diehl, E: The Marlborough Gems (2009), Story-Maskelyne, M.H.: The Marlborough Gems (1870), no. 621, Sapphirine chalcedony

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