A variety of the mineral chalcedony with white and reddish parallel bands. Sardonyx is often carved to create cameos. See also onyx.
Cameo of Antinous. Sardonyx. Ca. 130 CE. Bibliothèque Nationale de France, Paris.
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Cameo of Antinous. Sardonyx. Ca. 130 CE. Bibliothèque Nationale de France, Paris.