History and Origin

Discovered in Tanzania in the 1960s, tanzanite quickly became one of the most coveted gems for its rare, rich blue-violet tones.

Tanzania (near Mount Kilimanjaro)

Mostly comes from

Currently priced at

$400+

a Carat

Chemical Formula

CaCO₃ (Calcium Carbonate)

Hardness

on Mohs scale

Luster

Vitreous (Glassy)

Crystal System

Orthorhombic

Refractive Index

1.69

Specific Gravity

3.35

Color(s)

Blue to violet

Chemical Formula

CaCO₃ (Calcium Carbonate)

Hardness

Luster

Vitreous (Glassy)

Crystal System

Orthorhombic

Refractive Index

1.69

Specific Gravity

3.35

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.

Tanzanite

History and Origin

Color(s)

Help Guide

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Gemstones

Diamond

Sapphire

Ruby

Emerald