Rock Identifier

gemstone

Precious Coral and Jade

Corallium rubrum / Corallium spp. (Coral, CaCO3) and Nephrite/Jadeite (Jade, Ca2(Mg,Fe)5Si8O22(OH)2 / NaAlSi2O6)

AI-generated identification · may be incorrect

Coral: Hardness 3.5, pink-orange, vitreous to waxy luster, amorphous biomineral. Jade: Hardness 6.0-7.0, spinach green, greasy to waxy luster, monoclinic microcrystalline aggregate.

Identified October 12, 2026More gemstone →

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Physical properties

Coral: Hardness 3.5, pink-orange, vitreous to waxy luster, amorphous biomineral. Jade: Hardness 6.0-7.0, spinach green, greasy to waxy luster, monoclinic microcrystalline aggregate.

Formation & geological history

Coral is secreted by marine polyps in benthic sea beds; jade forms via high-pressure, low-temperature metamorphic conditions in subduction zones.

Uses & applications

Primary use is in fine jewelry, carved ornamental gemstones, and collector rings.

Geological facts

Natural precious coral has been harvested for ornaments since antiquity and reacts with mild acids due to its calcium carbonate composition.

Field identification & locations

Identifiable by coral's faint growth-ring structures and effervescence with dilute acid, paired with tough, carved translucent green jade leaves.

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