Sardonyx

Sardonyx is a form of Onyx, which is a cryptocrystalline form of quartz. Sardonyx is a variant in which the colored bands are sard (shades of red) rather than black. Pure black onyx is common, and perhaps the most famous variety, but not as common as onyx with banded colors.

Durable and easy to care for, onyx has a hardness of 7 and enviable toughness even when carved in intricate designs. The seal rings worn by ancient Romans are still in fine shape today. Clean with mild dish soap and let dry.

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Information Courtesy of AGTA