CLASSIFICATIONS

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Only type A jadeite are considered natural jadeite. Other types are all considered processed jadeite. All jadeite sold in Royan Jade are strictly Type A natural jadeite without chemical treatments.

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TYPE A (Natural Jadeite):

Natural jadeite without chemical treatments. Wax polishing process without destroying the structure of natural jade will not be regarded as a kind of chemical treatment.

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TYPE B: 

Jadeite with chemical treatments and resin injections.

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TYPE C:

Jadeite with dyeing treatments.

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TYPE B+C:

Jadeite with chemical treatments, resin injections and dyeing treatments.

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IDENTIFICATION METHODOLOGIES

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DESTRUCTIVE TESTS (for laboratory purposes):

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    Heating test: Heat resistance of natural jadeite is around 900-1000 degree Celsius. Processed jadeite will turn brown around 400 degree Celsius in a heating test. 

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    Dissolution test: Resin injected into processed jadeite can be dissolved by resin solution and hence processed jadeite will become opaque paste in a dissolution test. 

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NON-DESTRUCTIVE TESTS (for general identification purposes):

The following three specifications can be identified using instruments.

 

    Jadeite characteristics: weight, refractive index, specific gravity, etc

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    Dyeing treatments detection: can be identified by Tao's filter, spectrometer and microscope

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    Resin injections detection: can be identified by UV fluorescence test, specific gravity, microscope and infrared spectrometer

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Identification certificates for jadeite sold in Royan Jade are all issued by internationally recognized laboratories which test jadeite through the above non-destructive identification procedures.