Sommerville, Maxwell. Engraved Gems: Their History and an Elaborate View of Their Place In Art. Maxwell Sommerville, 1889.
Reference
- Object[4]
- no[4]
- gem[4]
- graeco-roman[1]
- amethyst[1]
- chalcedony[1]
- gold[1]
- heliotrope (mineral)[1]
- onyx[1]
- sardonyx[1]
- yes[4]



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