Organic Gemstones

Coral

Current Market Range

$50 - $300

Used since ancient times to ward off evil spirits.

Mediterranean Sea, Japan, Taiwan

Red, pink, orange, white, black

Chemical Formula

Al₂O₃ (Aluminum Oxide with trace elements)

Hardness

Luster

Dull (Earthy)

Crystal System

Refractive Index

1.49

Specific Gravity

2.6

Crystal System

Gemstones and minerals are classified into seven primary crystal systems based on their atomic structure.

Refractive Index

The refractive index (RI) of a material measure how much light is bent, or refracted, when entering the material from another medium.

Specific Gravity

The specific gravity (SG) of a substance is a measure of its density compared to water.

Chemical Formula

A chemical formula shows the types and quantities of atoms in a molecule.