Also known as carnelian, this translucent, reddish orange number of chalcedony was once thought to still the blood and calm the temper. Its various shades of red result from the existence of iron oxide. Stones might be uniformly coloured or faintly banded.
The very best carnelian is from India, where it's placed under the sun to alter brown tints to red.
Most carnelian available on the market is stained chalcedony from Brazil or Uruguay.
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