Mountain Jade — A Trade Term for Material That Is Not Jade
Mountain Jade — A Trade Term for Material That Is Not Jade
A misleading commercial label for dyed dolomite marble, quartzite, and serpentine — request testing before purchase
Mountain jade is a misleading commercial trade name applied to a variety of non-jade materials — most commonly dyed dolomite marble, quartzite, and serpentine — that are dyed and sometimes polymer-stabilised to imitate the appearance of jadeite or nephrite jade. The label is not a recognised gemmological designation and is prohibited by the disclosure standards of GIA, CIBJO, and the principal national jewellery trade organisations, which restrict the use of the word jade to true jadeite (a sodium-aluminium silicate of the pyroxene group) and nephrite (a calcium-magnesium-iron silicate of the amphibole group). Mountain jade trades widely in low-tier tourist and beaded-jewellery markets and is a recurring source of buyer disappointment when the substitution is later identified.
What mountain jade actually is
Material sold as mountain jade most commonly turns out to be one of three things on testing. Dyed dolomite marble (calcium magnesium carbonate, hardness around 3.5 to 4 on the Mohs scale) is a very common substrate, dyed in green or lavender to imitate jadeite colours. Dyed quartzite (a metamorphic rock dominantly composed of quartz, hardness 6 to 7) is harder and more durable than dolomite but still fundamentally not jade. Dyed serpentine (a magnesium silicate group, hardness 3 to 6) is sometimes encountered and is at least related to the geological setting in which jadeite forms — but is not itself jade. Other substrates and dye combinations are encountered occasionally.
None of these materials shares the chemistry, mineral structure, or physical properties of true jade. Critically, none possesses the toughness — the resistance to fracture — that distinguishes nephrite and jadeite from other green ornamental materials. The toughness of true jade derives from its felted interlocking microcrystalline structure, which mountain jade substitutes do not approximate.
How to identify the substitution
Standard gemmological tests easily distinguish jade from mountain jade substitutes. Specific gravity measurement: jadeite around 3.30 to 3.36 and nephrite around 2.90 to 3.05, dolomite around 2.85, quartzite around 2.65, serpentine around 2.50 to 2.65 — the differences are diagnostic. Refractive index: jadeite around 1.66, nephrite around 1.61, dolomite around 1.50 to 1.68 (variable), quartzite around 1.54, serpentine around 1.55. Hardness testing on inconspicuous surfaces: dolomite is far softer than any true jade and can be scratched with a fingernail-and-coin range of hardness instruments; quartzite is harder than nephrite but distinguishable by other tests. Infrared and Raman spectroscopy at a major laboratory provides definitive identification.
Why disclosure matters
Beyond the simple buyer-protection issue, the use of mountain jade as a label undermines consumer confidence in the broader jade trade and devalues the genuine article. The CIBJO Coloured Stone Book, the AGTA Gemstone Information Manual, and the GIA-disseminated trade education materials all explicitly prohibit the use of jade in trade names for non-jade material. Regulatory enforcement varies by jurisdiction, but in many markets the misrepresentation of mountain jade as jade can support consumer-protection claims.
In the trade
Skyjems treats mountain jade as a misleading designation and recommends that buyers request species identification before purchase of any material sold under that label. Genuine jade — both jadeite and nephrite — is a beautiful and meaningful material with its own distinct identity and trade vocabulary; the mountain jade label contributes nothing useful and obscures meaningful identification. Where the substrate identity is established (for example, dyed dolomite marble), honest disclosure under that name supports a legitimate market for an inexpensive ornamental material without misleading the buyer about what they are purchasing.