GEMSTONE ENCYCLOPEDIA
Sardonyx
Explore its visual character, mineral facts, jewellery suitability and traditional place in cultural history.
ColourBrown/red with light bands
Mohs hardness6.5–7
Mineral familyBanded chalcedony
BirthstoneAugust
Colour and appearance
Brown/red with light bands
Traditional meaning and symbolism
Historically used in cameos and seals
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Traditional meanings are cultural associations, not proven medical benefits.