Carnelian
Natural stone
An orange to red chalcedony, coloured by iron. Tough and long loved for seals and signet stones; much carnelian is heated or dyed.
Hardness (Mohs): 6.5–7
Natural stone
An orange to red chalcedony, coloured by iron. Tough and long loved for seals and signet stones; much carnelian is heated or dyed.
Hardness (Mohs): 6.5–7