History and Origin

Opal, revered by ancient Romans as a symbol of love and hope, captivates with its iridescent play of colors. Discovered in Australia, it remains one of the most enchanting and unique gemstones.

Australia, Ethiopia, Mexico, USA

Mostly comes from

Currently priced at

$10 - $10,000+ per carat

a Carat

Chemical Formula

SiO₂·nH₂O

Hardness

5.5

on Mohs scale

Luster

Waxy

Crystal System

Refractive Index

1.37

Specific Gravity

1.98

Color(s)

White, black, blue, orange-red (fire opal)

Chemical Formula

SiO₂·nH₂O

Hardness

5.5

Luster

Waxy

Crystal System

Refractive Index

1.37

Specific Gravity

1.98

Help Guide

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.

Opal

History and Origin

Color(s)

Help Guide

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