How to tell if jade is real or fake
Jade Education
How to tell if jade is real
Most of what circulates online about testing jade at home is folklore. Here is what actually holds up, what only narrows things down, and what genuinely answers the question.
Start with the word
"Jade" is two different stones.
Jade is an umbrella term for two distinct materials: jadeite and nephrite. Both are genuine jade, and they are not the same gem.
Jadeite is the rarer, denser, more valuable one, the stone the collector market is priced around, with a specific gravity near 3.34 and a refractive index around 1.66. Nephrite is tougher but far more common and much less expensive, with a specific gravity near 2.95 and a refractive index around 1.61.
So before anything else, you are answering three separate questions: is it jadeite, is it nephrite, or is it neither.
What home checks can and cannot do
They can rule a fake out. They cannot prove a real.
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Weight and feel
Real jadeite is dense and feels heavy for its size, and noticeably cool at first touch. Glass and resin imitations feel lighter and warmer. A useful hint, but some look-alikes are dense and cool as well, so it narrows the field and nothing more.
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Sound
Tapped gently, jadeite rings with a clear, high note. Resin and plastic thud. It is a real signal, but it takes an experienced ear and a stone to compare against.
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Light and structure
Hold it to a light. Real jadeite shows an interlocking crystal structure, and often natural features such as cotton, root color, or stone lines. Glassy, perfectly even color with no structure at all is a warning, not a reassurance.
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The scratch test, please don't
Scraping jewelry with a knife, file, or glass proves nothing and damages the piece. It is not a gemological test, and no qualified laboratory uses it. If someone tells you to scratch your jade, ignore them.
Where the folklore fails
Treatment is the part nobody can eyeball.
This is the trap almost every buyer walks into. A stone can be genuine jadeite and still have been treated, whether bleached, polymer-filled, or dyed. It passed every home check. It is, mineralogically, jade. And it is not Type A.
The question most people are actually asking is not "is this jade," but "has anything been done to it." These common tests do not reliably answer that:
- The hot needle or burn test damages polish, wax, resin, dye, and the mounting, and gives misleading results.
- UV fluorescence varies with color, impurities, coatings, and the wavelength of light used. A glow, or the absence of one, proves nothing either way.
- Scratching it is destructive and inconclusive.
- A close-up photo, or a loupe on the kitchen table can reveal clues, but cannot certify the absence of polymer.
How it is actually done
Instruments, in a laboratory.
Gemological identification is measurement work, and it does not care how the stone photographs. A laboratory builds its answer from several instruments together:
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Refractive index
How light bends through the material. Jadeite reads near 1.66 and nephrite near 1.61, which separates jade from most simulants. Treatment does not usually move this number enough to identify it on its own.
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Specific gravity
How dense the stone is, measured by weighing it in water. Jadeite sits near 3.34. Bleaching and polymer impregnation can lower the reading, so a low figure is a strong hint of treatment, but a hint rather than proof.
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Magnification
Under the microscope, a gemologist looks for dye pooled in fissures, filled cracks, and an atypical grain. Useful clues, rarely conclusive alone.
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Infrared spectroscopy
The decisive test for polymer. Infrared light reveals the resin's signature inside the stone, the method gemological laboratories rely on to identify impregnation conclusively.
Put together, that is how a piece is identified as jadeite or nephrite and classified as untreated, dyed, bleached, polymer-impregnated, or a combination.
The answer
Ask for the report before you pay.
For jadeite treatment specifically, the recognized authority is the Gemological Institute of America (GIA). A GIA report is a laboratory's statement about your stone, the material and what has been done to it, and it can be verified against their records by report number.
If a piece matters to you, that is the document to ask for. Any honest seller should be able to produce one.
A good stone should never be afraid of a laboratory.
Keep reading
More on jade, from the stone up.
Every piece we sell is natural Type A.
No treatments, no dyes, and the certificate is included rather than sold as an add-on.