gemstone
Red Coral (Precious Coral)
Corallium rubrum (primarily CaCO3 with carotenoid pigments)
AI-generated identification · may be incorrectHardness: 3.5; Color: vibrant red to pinkish-orange; Luster: waxy to vitreous when polished; Specific Gravity: 2.6-2.7.
- Hardness
- 3
- Color
- vibrant red to pinkish-orange
- Luster
- waxy to vitreous when polished
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Physical properties
Hardness: 3.5; Color: vibrant red to pinkish-orange; Luster: waxy to vitreous when polished; Specific Gravity: 2.6-2.7.
Formation & geological history
Formed biologically by marine polyps in benthic reef environments, primarily harvested in the Mediterranean Sea and Western Pacific.
Uses & applications
Used predominantly in fine jewelry, beads, cameos, and ornamental carvings.
Geological facts
Ancient Romans believed red coral protected children from harm, and natural untreated Mediterranean 'oxblood' coral is among the most prized organic gems.
Field identification & locations
Identified by effervescence under dilute acid (due to calcium carbonate) and a fine wood-grain-like longitudinal texture under magnification.
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