Is Your Topaz Real or Fake?
How to tell genuine topaz from imitations
With topaz the honesty issues are treatment and naming rather than outright counterfeits. Irradiated blue and coated 'mystic' topaz are genuine topaz with man-made color, while cheaper citrine and glass are sometimes sold under the 'topaz' name.
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Common topaz fakes & look-alikes
- 'Mystic' / coated topaz. An oily rainbow sheen over the whole stone; the color sits on the surface and can show scratches or wear at facet edges.
- Citrine sold as 'topaz'. Yellow quartz (Mohs 7) marketed as 'topaz' — softer than real topaz and a different, cheaper stone.
- Glass. Rounded bubbles, a warm feel, and molded edges; genuine topaz is hard, slippery-feeling and crisply faceted.
Simple at-home tests
- 1Hardness. Topaz is Mohs 8 and scratches quartz; citrine (quartz, 7) and glass will not scratch topaz.
- 2Surface check. A rainbow film with edge wear indicates a coated 'mystic' stone rather than natural color.
- 3Feel. Topaz has a characteristic slightly slippery, cool feel and perfect cleavage; glass feels warmer and shows bubbles.
At-home tests are indicative, not definitive — for valuable pieces, get a professional gemologist's opinion.
The bottom line
A very hard (Mohs 8), crisply faceted, slippery-cool stone is genuine topaz. A surface rainbow film means coated 'mystic' topaz; a softer yellow stone called 'topaz' is usually citrine; bubbles and warmth mean glass.
FAQ
- How can I tell if my topaz is real?
- A very hard (Mohs 8), crisply faceted, slippery-cool stone is genuine topaz. A surface rainbow film means coated 'mystic' topaz; a softer yellow stone called 'topaz' is usually citrine; bubbles and warmth mean glass.
- Is blue topaz valuable?
- Not very — almost all blue topaz is irradiated colorless topaz, which is abundant and inexpensive ($5–$40 per carat). It's genuine topaz, just a low-value treated color.
- What is the most valuable topaz?
- Natural 'imperial' topaz (warm orange to pink-red) and fine natural pink topaz are the prizes, reaching hundreds to thousands of dollars per carat — far above common colorless or treated blue.
- Is mystic topaz real topaz?
- The stone is real colorless topaz, but its rainbow color is a thin surface coating that can scratch or wear off. It's an inexpensive novelty, not a valuable natural color.
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