Semi-Precious Gemstones

Tanzanite

Current Market Range

$400+

Discovered in Tanzania in the 1960s; prized for rarity.

Tanzania (near Mount Kilimanjaro)

Blue to violet

Chemical Formula

CaCO₃ (Calcium Carbonate)

Hardness

Luster

Vitreous (Glassy)

Crystal System

Orthorhombic

Refractive Index

1.69

Specific Gravity

3.35

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.