Carnelian Value, Price, and Jewelry Information

By Hyperdeath (Own work) [GFDL or CC-BY-SA-3.0-2.5-2.0-1.0], via Wikimedia Commons

Carnelian

The best-known and generally least expensive variety of chalcedony is carnelian. It ranges in color from yellow-orange to rich, near reddish orange, to orangey brown, and varies from semi-opaque to highly translucent.

Carnelian Information

Data Value
Name Carnelian
Is a Variety of Chalcedony
Colors Red, orange
Crystallography Hexagonal, microcrystalline.
Refractive Index 1.535 to 1.539
Hardness 6.5 - 7
Wearability Very Good
Fracture Uneven
Specific Gravity 2.58-2.64
Birefringence 0.004
Cleavage None
Dispersion None.
Luminescence Blue-white
Luminescence Present Yes
Luminescence Type Fluorescent
Enhancements Heating.
Typical Treatments Heat Treatment
Transparency Translucent to opaque
Formula

SiO2

Pleochroism

Absent.

Optics

Uniaxial (+).

Optic Sign Uniaxial +

The best-known and generally least expensive variety of chalcedony is carnelian. It ranges in color from yellow-orange to rich, near reddish orange, to orangey brown, and varies from semi-opaque to highly translucent. Iron is the source of its color and as a result it can be easily heat treated, (even by the sun’s heat alone,) to darken red tones as the iron is oxidized. You should assume, unless informed otherwise, that any piece of carnelian has been enhanced in this way.

Sources

Most commercial carnelian comes from India, but it is mined world wide. Gem-quality sources also include Brazil, Egypt, and Uruguay.

carnelian

By Hyperdeath (Own work) [GFDL or CC-BY-SA-3.0-2.5-2.0-1.0], via Wikimedia Commons

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