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 of jadeite is directly linked to its quality. In the market, we often hear terms like 'Type A', 'Type B', and 'Type C' goods. These are not just simple classifications but fundamental distinctions regarding the degree and nature of jadeite treatment and its value. For ordinary consumers, mastering this basic knowledge is crucial to avoid being scammed.

Conclusion First:

The core difference between Type A, B, and C jadeite lies in whether it has undergone artificial optimization treatment and the degree and nature of that treatment. Simply put, Type A jadeite is natural jadeite that has not undergone any filling or dyeing treatment; Type B jadeite has been soaked in strong acid, had impurities removed, and then filled with resin; Type C jadeite is artificially dyed jadeite. Their value, stability, and collection potential differ vastly.

Detailed Analysis:

  • Type A Jadeite (Untreated Natural Jadeite)

* Definition: Refers to jadeite that has only undergone traditional physical processing, such as cutting, grinding, carving, and polishing, which does not alter its internal structure or chemical composition. It retains the natural structure, color, and luster of jadeite, making it natural jadeite with collection and wearing value.
* Characteristics:
* Structure: Internal structure is compact, with visible interwoven fibrous or granular crystal structures, commonly known as 'cuicui' (jadeite's characteristic texture) or 'fly wings'.
* Luster: Exhibits a vitreous luster, with a delicate and smooth surface.
* Color: Color is naturally distributed, with color roots, natural transitions, varying depths, and uneven distribution, which are signs of its naturalness.
* Transparency: Ranges from opaque to semi-transparent and transparent. The better the quality, the higher the transparency.
* Fluorescence: Usually no or weak fluorescence under UV light.
* Value: Highest value, the only type of jadeite with collection and investment value.

  • Type B Jadeite (Acid-Washed and Resin-Filled Jadeite)

* Definition: Refers to jadeite that has been treated with strong acid to remove internal impurities (such as yellowish-brown iron substances), improving transparency and clarity, and then filled with epoxy resin or other polymer materials to fill cracks and pores. This treatment destroys the original structure of the jadeite, making its stability poor.
* Characteristics:
* Structure: Internal structure is corroded by acid, and crystal gaps are filled with resin. The structure is loose, and 'acid-etched network patterns' or 'spiderweb patterns' may be visible.
* Luster: Surface luster is weaker, often presenting a resinous or waxy luster, not as bright as the vitreous luster of Type A jadeite. Over time, it may 'dehydrate', and its luster will dim.
* Color: The color appears very 'clean' but often looks dull and superficial, lacking the natural vibrancy of natural jadeite.
* Transparency: Often appears to have good 'water' (transparency), but this 'goodness' is due to treatment and is unnatural.
* Fluorescence: Often shows obvious blue-white or yellow-green fluorescence under UV light, which is characteristic of resin filling.
* Value: Extremely low value, no collection value. It will discolor, yellow, lose luster, or even crack after prolonged wear.

  • Type C Jadeite (Artificially Dyed Jadeite)

* Definition: Refers to jadeite that has been artificially dyed to present vibrant colors. Dyes typically penetrate along cracks or crystal gaps in the jadeite.
* Characteristics:
* Structure: Internal structure may not be damaged (if only dyed), but dyes will accumulate along cracks or crystal gaps.
* Luster: Luster is usually normal, but color distribution is unnatural.
* Color: Color is too bright and uniform, lacking the color roots and natural transitions of natural jadeite. Dye accumulation may be visible in cracks or between crystal grains, commonly known as 'floating color' or 'evil color'. Wiping with an alcohol-soaked cotton swab may sometimes cause color fading (but not all Type C jadeite will fade).
* Transparency: Consistent with the original jadeite's transparency.
* Fluorescence: Some dyes may exhibit fluorescence under UV light.
* Value: Lowest value, potentially harmful to the human body (dyes), no collection value whatsoever.

Specific Cases/Data:

Taking the Sotheby's Hong Kong Spring Auction in 2023 as an example, a natural Burmese jadeite cabochon with a diamond necklace was sold for an astonishing HKD 120 million. This piece is undoubtedly a top-grade Type A jadeite, and its value reflects the rarity, beauty, and investment potential of natural jadeite. In contrast, Type B and C jadeite, no matter how similar they appear, cannot enter the high-end auction market. Their value is often only tens to hundreds of yuan, or even lower, and will further depreciate over time.

According to data from the Gemological Association of China (GAC), the number of consumer complaints annually due to purchasing Type B and C jadeite remains high. This indicates a large quantity of treated jadeite in the market, and consumers' lack of discernment is a major reason.

How Can Ordinary People Distinguish Them? Practical Advice:

For non-professionals, the following points are effective for initial judgment:

  • Observe the Luster: Type A jadeite usually exhibits a vitreous luster, bright and sharp; Type B jadeite may show a waxy or resinous luster, appearing dull and unnatural. Type C jadeite's luster is similar to Type A, but its color is abnormal.

  • Observe the Color:

* Type A: Color distribution is natural, with color roots, natural transitions in depth, and unevenness is normal. Even if it's entirely green, there will be variations in shade.
* Type B: Color often appears 'very clean' but lacks vibrancy, appearing dull and superficial.
* Type C: Color is overly bright and uniform, often with dye accumulation in cracks or between grains, which is more apparent under magnification.
  • Observe the Structure ('Fly Wings' and 'Orange Peel Texture'):

* Type A: Under strong light, rotating the jadeite may reveal flashing cleavage planes of internal crystals, known as 'fly wings'. The surface may have a slight 'orange peel texture' (tiny irregularities formed by the jadeite crystal structure after polishing).
* Type B: After acid washing, the internal structure is damaged. After resin filling, 'acid-etched network patterns' may appear on the surface, resembling a spiderweb, or the surface luster may be uneven with a sunken feel. The 'orange peel texture' of Type B jadeite is often indistinct or covered by resin.
  • Feel the Weight: Jadeite has a high density and feels heavy. Type B jadeite, due to being filled with lower-density resin, will feel slightly lighter than a Type A jadeite of the same volume, but this difference is difficult for ordinary people to accurately judge.

  • Listen to the Sound: Gently tap (be careful not to damage it). Type A jadeite produces a crisp and pleasant sound with a metallic resonance; Type B jadeite produces a dull sound, like tapping plastic.

  • UV Fluorescence Lamp: This is one of the most direct auxiliary tools. Type A jadeite usually shows no or weak fluorescence under UV light (a very few natural jadeites may produce weak fluorescence due to trace elements). Type B jadeite, due to the resin filling, often emits obvious blue-white or yellow-green fluorescence under UV light. For Type C jadeite, it depends on the type of dye; some have fluorescence, some do not.

  • Seek Professional Appraisal: The safest and most accurate method is to send it to a nationally qualified jewelry and jade appraisal institution, such as the National Gemstone Testing Center (NGTC) or the Gemological Institute of China University of Geosciences. They will issue an authoritative appraisal certificate, clearly stating whether it is 'Type A Jadeite' or 'Treated Jadeite'.


Summary:

The distinction between Type A, B, and C jadeite is the cornerstone of understanding the jadeite value system. Type A jadeite is a natural gift, carrying culture and value; Type B and C jadeite are products of artificial intervention, and their value and stability are greatly diminished. As consumers, we should always be vigilant. When purchasing jadeite, be sure to choose reputable merchants and request an authoritative appraisal certificate. Remember, the principle of 'you get what you pay for' is particularly applicable in the jadeite market. Do not be greedy for cheap prices and end up buying treated products. For investing in and collecting jadeite, discerning eyes are important, but more importantly, it is about respecting professional knowledge and trusting authoritative appraisals. I hope my sharing helps everyone avoid detours and become a discerning buyer in the journey of jadeite appreciation.

Disclaimer: The information provided in this article is for reference and learning purposes only and does not constitute any investment advice. Jadeite identification is a complex field. It is recommended to seek help from professional appraisal institutions when purchasing high-value jadeite.