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.