Hello everyone, I am a certified auction house expert on Zhihu, and I am delighted to discuss jadeite identification with you. As the 'King of Jade', the value and quality of jadeite are directly linked. The distinction between 'Type A', 'Type B', and 'Type C' is a core standard for measuring its quality and market value. For ordinary consumers, mastering this basic knowledge can not only help avoid deception but also enable them to make informed choices for collection or wearing.

Conclusion First: Type A jadeite is natural and untreated by any chemicals. Type B jadeite is bleached and filled with resin after strong acid treatment. Type C jadeite is artificially dyed. Their fundamental difference lies in whether they have undergone destructive chemical treatment and artificial coloring, which directly affects the structural stability, durability, and market value of jadeite. Ordinary people can effectively distinguish them by observing luster, structure, color distribution, sound, and by utilizing professional testing institutions.

Detailed Analysis:

  • Type A Jadeite (Natural Jadeite):

* Definition: Refers to natural jadeite that has not undergone any chemical treatment, only traditional physical processing such as cutting and polishing. Its internal structure, color, clarity, and other characteristics are naturally formed, maintaining the original physical and chemical properties of jadeite.
* Characteristics:
* Luster: Exhibits a vitreous luster, with a smooth, bright surface and sharp reflections.
* Structure: Under magnification, the characteristic 'fly-wing' effect (cleavage planes flashing) can be seen, indicating a dense, interwoven granular structure.
* Color: Color is naturally distributed, with color roots, natural transitions, varying depths, and the characteristic of 'color following form'. Natural green often has yellow or blue undertones.
* Feel: Cool and heavy, with high density.
* Sound: Tapping gently produces a crisp, melodious 'steel sound'.
* Value: Highest market value, with potential for preservation and appreciation.

  • Type B Jadeite (Bleached and Filled Jadeite):

* Definition: Refers to jadeite that has been treated with strong acid to remove internal impurities and stains, then injected with epoxy resin or similar organic polymer for filling and consolidation. This treatment destroys the original structure of the jadeite, reducing its durability.
* Characteristics:
* Luster: The surface often exhibits a 'waxy luster' or 'resinous luster', which is duller or cloudier than Type A. Over time, it may yellow or become dull.
* Structure: Under magnification, acid-etched net-like patterns may be visible. The internal structure is loose, and the resin filler may show 'spiderweb-like' or 'fly-wing-like' cracks. Infrared spectroscopy can detect absorption peaks of organic polymers.
* Color: The color may appear 'cleaner' but often seems superficial and unnatural, lacking color roots and the vibrancy of Type A.
* Feel: Compared to Type A, it may feel slightly lighter, with a slightly lower density.
* Sound: Tapping gently produces a dull 'plastic sound' or 'tile sound'.
* Value: Extremely low market value, no collection value, and may pose potential health risks (release of harmful substances as the resin ages).

  • Type C Jadeite (Dyed Jadeite):

* Definition: Refers to jadeite that has been artificially dyed to impart non-natural colors. Dyes typically penetrate along cracks or intergranular spaces to achieve an aesthetic effect.
* Characteristics:
* Luster: Similar to Type A, but the color appears overly vibrant, uniform, and unnatural.
* Structure: Under magnification, color often concentrates along cracks or appears as net-like or thread-like distributions, with color accumulation at the edges. Wiping with an alcohol-soaked cotton swab may sometimes cause color to rub off (though this method is not recommended for regular use to avoid damage).
* Color: Color is excessively uniform and intense, lacking layers and color roots. Under a Chelsea filter, some dyes may change color.
* Feel: Similar to Type A.
* Sound: Similar to Type A.
* Value: Extremely low market value, considered inferior, and has no collection value.

Specific Cases/Data:

In the auction market, we frequently observe the astonishing performance of high-quality Type A jadeite. For example, at Sotheby's Hong Kong Spring Sale in 2017, a natural jadeite bead necklace sold for approximately HKD 102 million, its value based on its pure natural Type A quality, excellent clarity and color, and exquisite craftsmanship. Type B and Type C jadeite, being essentially chemically treated 'disguises', are never offered in reputable auction houses. Their market price is often one-thousandth or even less than that of Type A jadeite with a similar appearance, and their appearance will degrade over time, further depreciating their value.

According to data from the Gemological Association of China (GAC), the number of consumer complaints arising from the purchase of Type B and Type C jadeite remains high each year, highlighting the lack of identification skills among ordinary consumers.

How Can Ordinary People Distinguish Them? Practical Advice:

For non-professionals, the following points are relatively easy to grasp for preliminary identification:

  • Observe Luster: Type A jadeite has a vitreous luster, clear and bright, with sharp reflections. Type B often has a waxy or resinous luster, appearing somewhat oily or cloudy, not crisp. Type C's luster is similar to Type A, but the color is overly vibrant and unnatural.

  • Observe Color: Type A's color is natural, with color roots, varying in depth and intensity, and transitioning naturally. Type B's color often appears 'floating', without color roots, looking 'clean' but lacking vitality. Type C's color is excessively uniform and vibrant, giving a 'fake' impression, and often distributed along cracks.

  • Observe Structure (with Magnification): If you can get a 10x or 20x magnifier, examine the surface and interior of the jadeite. Type A will show natural 'fly-wing' structures. Type B may show acid-etched net-like patterns on the surface, and internal 'spiderweb-like' or 'fly-wing-like' structures formed by resin filling. Type C's color may accumulate at cracks.

  • Listen to Sound: Suspend the jadeite with a thin string and gently tap it with a hard object (like a coin). Type A will produce a crisp, melodious 'steel sound', while Type B will produce a dull 'plastic sound' or 'tile sound'. Type C's sound is similar to Type A, but if it has undergone Type B treatment, it will also be dull.

  • Feel: Type A jadeite feels cool and heavy, with high density. Type B may feel slightly lighter.

  • Price Judgment: The desire for a 'bargain' is a major reason for deception. If a piece of jadeite has excellent clarity, color, and texture but is priced far below market value, it is highly likely to be Type B or Type C. High-quality Type A jadeite is expensive; do not fall for temptations like 'clearance sales' or 'fire sale prices'.

  • Seek Professional Appraisal: This is the safest and most reliable method. When purchasing high-value jadeite, always ask the merchant to provide an appraisal certificate issued by a nationally recognized gemological testing institution. The certificate will clearly state whether it is 'Natural Jadeite (Type A)' and include detailed testing data and images. Common authoritative institutions include: National Gemstone Testing Center (NGTC), China University of Geosciences Gem Testing Center, etc.


Summary:

The distinction between Type A, Type B, and Type C jadeite is the cornerstone of understanding the jadeite value system. Type A represents natural beauty, Type B is a chemical 'disguise', and Type C is artificial 'deception'. As consumers, enhancing your identification skills, maintaining a rational consumption mindset, and ultimately relying on professional appraisals from authoritative institutions are the golden rules to ensure you purchase truly valuable jadeite. Remember, investing in or collecting jadeite is about pursuing its natural spirituality and rarity, not just its superficial appearance. I hope my answer helps everyone discern authenticity in the world of jadeite and make wise choices.