What's That Rock?Topaz
A hard aluminum silicate gem found in many colors. Blue topaz on the market is usually color-treated colorless topaz.
How to identify Topaz
- Very hard: scratches quartz
- Splits along one perfect flat plane if struck
- Heavier than quartz of the same size
Often confused with
- Quartz and citrinelighter
- Aquamarine
- Glass
- Colorless sapphire
Real or fake?
- Cleavage is a clue: a rough topaz breaks flat
- Most blue topaz is irradiated and heated; it is stable but not natural color
Is Topaz valuable?
Moderate; colorless is cheap, imperial orange-pink topaz is expensive.
Typical retail prices
Cut gemstone$5–60per carat
Collector specimen$10–150each
Natural imperial topaz costs many times more than blue topaz.
Typical retail ranges in US dollars, compiled from public dealer and marketplace listings in October 2026. Real prices vary widely with quality, size and origin. This is general information, not an appraisal.
What changes the price
- Color: rare natural imperial (orange-pink) and pink topaz cost hundreds to thousands per carat; colorless and blue are cheap
- Treatment: nearly all blue topaz is irradiated and heated, stable but not natural
- Clarity and size: topaz crystals are large and clean, so big stones are common in the cheap colors
- Fragile: it cleaves easily, so edges chip
Uses
- Jewelry
Care
Can chip along its cleavage. Avoid knocks and sudden temperature changes.
Identifying a stone from a description or a photo is an estimate. Many stones look alike. Ask an expert or a gem lab before you buy, sell or rely on an identification.
Updated October 2026