Overview


Jadeite jade, with its warm texture, rich colors, and profound cultural connotations, has been deeply loved by East Asian peoples since ancient times. However, the market is flooded with various treated jadeite, among which Type A, Type B, and Type C are the most common. Type A refers to natural jadeite that has not undergone any artificial chemical treatment. Type B is jadeite that has been acid-washed and polymer-impregnated. Type C is jadeite that has been dyed. For consumers, mastering the identification methods for Type A, B, and C jadeite is crucial, not only to avoid financial losses but also to ensure the purchase of genuinely collectible natural beautiful jade. This tutorial will start with basic knowledge, detail the identification methods for Type A, B, and C jadeite, and provide practical tips and common misconceptions, helping you become an expert in jadeite identification.

Basic Knowledge


Before delving into identification methods, we first need to understand some basic knowledge about jadeite:

  • Definition of Jadeite: Jadeite is a type of hard jade, primarily composed of jadeite minerals, with small amounts of other pyroxene and amphibole minerals. Its unique fibrous interlocking structure gives it toughness.

  • Type A (Natural Jadeite): Refers to natural jadeite that has not undergone any chemical treatment, only mechanical processing (cutting, carving, polishing). Its color, structure, and luster are naturally formed, possessing the highest collection value and appreciation potential.

  • Type B (Polymer-Impregnated Jadeite): Refers to jadeite that has been soaked in strong acid to remove impurities and fissures, then filled and solidified with organic polymers (such as epoxy resin). Treated jadeite will have improved transparency, but its structure is damaged, luster is dull, and durability is poor.

  • Type C (Dyed Jadeite): Refers to jadeite that has been artificially dyed to make its color more vibrant or to change its original color. Dyes usually penetrate along fissures or intergranular spaces, with the color floating on the surface and appearing unnatural.

  • Type B+C: Possesses characteristics of both Type B and Type C, meaning it has been acid-washed, polymer-impregnated, and then dyed.


Identification Methods (Step-by-Step)


We will detail the identification steps for Type A, B, and C jadeite from five aspects: visual inspection, tactile sensation, tapping, UV light detection, and professional instrument testing.

Step One: Visual Inspection (Most Direct and Commonly Used)

1. Observe Luster:
* Type A: Exhibits a vitreous luster, with a smooth, bright surface and sharp reflections, appearing as clear as glass. When rotating the jadeite, the reflections will move with it, creating a dynamic feel.
Example:* A well-polished natural jadeite bangle has a mirror-like surface with clear reflections, capable of mirroring surrounding objects.
* Type B: Surface luster is weaker, exhibiting a waxy or resinous luster, sometimes appearing dull and unnatural with blurry reflections. This is because the filling resin has lower hardness, making it difficult to achieve a vitreous luster after polishing.
Example:* A polymer-impregnated jadeite pendant appears greasy on the surface, with a dull luster, lacking the clarity of natural jadeite.
* Type C: May also exhibit a vitreous luster, but its color is often unnatural and may be accompanied by the waxy luster of Type B.

2. Observe Color:
* Type A: Color distribution is natural, with color roots, natural color transitions, varying depths, and a "lively" feel. Even for fully green jadeite, its color will have subtle variations in depth, not appearing overly uniform.
Example:* A natural icy-grade vibrant green jadeite, its green color emanates from within, with varying depths, clear color roots, and natural transitions between green and the base color.
* Type B: Colors are usually natural, but due to the loosened structure after acid treatment, transparency increases, and colors may appear "floating" or "diffused," lacking cohesion.
* Type C: Colors are overly vibrant, uniform, lacking layering and color roots. Colors often distribute along fissures or intergranular spaces, appearing reticulated, thread-like, or dotted, with distinct boundaries from the base color, appearing to "float" on the surface and unnatural. Sometimes, under magnification, color enrichment along fissures can be observed.
Example:* A dyed jadeite bangle, its green color is incredibly uniform. Under magnification, green can be seen penetrating along tiny cracks, with harsh color boundaries.

3. Observe Structure ("Fly Wings" and "Orange Peel Effect"):
* Type A: Under strong light, when rotating the jadeite, cleavage planes may sometimes flash, commonly known as "fly wings" (reflections from jadeite crystal cleavage planes). The surface may exhibit a subtle "orange peel effect" (tiny irregularities formed after polishing), but is generally smooth.
Example:* Observing the polished surface of a natural jadeite in sunlight, occasionally small, shimmering reflections can be seen, which are "fly wings."
* Type B: After acid washing and polymer impregnation, the crystal structure of jadeite is damaged, and the surface will show a distinct "orange peel effect" with deeper pits, appearing reticulated or with acid etch marks. Under magnification, the surface will exhibit spiderweb-like acid etch marks and filled polymer material. "Fly wings" are not visible.
Example:* Under a 10x magnifying glass, observing the surface of a Type B jadeite reveals many irregular depressions and fine reticulated patterns, which are traces of acid etching.
* Type C: Structural characteristics are similar to Type A or Type B, but the color is unnatural.

4. Observe Impurities and Fissures:
* Type A: Natural jadeite may contain natural cotton, veins, black spots, stone lines, etc. These are naturally formed characteristics and do not affect its essence. Fissures are usually naturally formed and have sharp edges.
* Type B: After acid washing, natural impurities and fissures are removed or filled, but the filling material (polymer) may appear as bubbles, flocculent material, or turbidity under magnification. Fissure edges will become rounded, no longer sharp.
* Type C: Colors often penetrate along fissures, so fissures will appear particularly prominent, with color enrichment.

Step Two: Tactile Sensation

* Type A: High density, feels heavy and cool to the touch, with a noticeable weighty sensation. At room temperature, placing the jadeite against the cheek or back of the hand will feel distinctly cool, and this sensation will last longer.
* Type B: Due to the filling with lower-density resin, it feels relatively lighter, and the coolness is not obvious or lasts for a shorter time.
* Type C: Tactile sensation is similar to Type A or Type B, depending on whether it has been polymer-impregnated.

Step Three: Tapping (Limited to complete items like bangles)

* Type A: Gently tapping will produce a crisp, pleasant metallic sound with a long resonance. This is due to its dense structure and good elasticity.
* Type B: Tapping sound is dull, short, or even produces a "clack-clack" plastic sound. This is because the internal structure is damaged, and the filled polymer absorbs vibrations.
* Type C: Tapping sound is similar to Type A or Type B, depending on whether it has been polymer-impregnated.
Operation Tip:* Tap gently to avoid damaging the jadeite. You can suspend the jadeite with a thin string and gently tap it with a coin or another piece of jadeite.

Step Four: Ultraviolet (UV) Lamp Detection

* Type A: Under a UV lamp, there is usually no fluorescence or weak fluorescence (a very small number of natural jadeite may exhibit weak fluorescence due to trace fluorescent substances).
* Type B: Most Type B jadeite's organic polymer will emit obvious blue or yellow-green fluorescence under a UV lamp. Stronger fluorescence indicates more severe polymer impregnation.
Operation Tip:* Purchase a portable UV lamp and conduct detection in a dark room. Pay attention to the UV lamp's wavelength; long-wave UV (365nm) and short-wave UV (254nm) may show different effects, but long-wave UV is more commonly used for Type B identification.
* Type C: If it is dyed Type C jadeite, there is usually no fluorescence. However, if it is Type B+C, it will exhibit the fluorescence reaction of Type B.

Step Five: Professional Instrument Testing (Most Accurate and Reliable)

When the above methods are inconclusive or if there are doubts about the results, professional appraisal institutions should be sought. Professional appraisal institutions will use the following instruments for testing:

  • Infrared Spectrometer (FTIR): This is the most accurate method for identifying Type B jadeite. The organic polymer in Type B jadeite will show specific absorption peaks on the infrared spectrum, while Type A does not.

  • Raman Spectrometer: Can analyze the mineral composition of jadeite, assisting in determining whether it is natural jadeite.

  • Densitometer: Precisely measures the density of jadeite. Type A jadeite density is usually between 3.30-3.36g/cm³, while Type B's density will be slightly lower due to polymer impregnation.

  • Refractometer: Measures the refractive index of jadeite. Type A jadeite's refractive index is usually around 1.66.

  • Microscope: A high-power microscope can more clearly observe the surface structure, internal characteristics, and distribution of dyes in jadeite.


Common Misconceptions

  • Misconception of "the more transparent, the better": Not all highly transparent jadeite is Type A. Type B jadeite's transparency significantly improves after acid treatment, but its structure has been damaged.

  • Misconception of "presence of cotton means fake": The presence of cotton, veins, stone lines, etc., within natural jadeite is normal and a sign of its natural origin; it cannot be used to determine it as fake.

  • Misconception of "certificate guarantees everything": The authority of a certificate depends on the appraisal institution. Only certificates issued by nationally recognized and qualified appraisal institutions are reliable. At the same time, be wary of "fake certificates" or "reused certificates."

  • Misconception of "the greener, the more expensive": The value of jadeite depends not only on color but also on clarity (种水), texture, craftsmanship, and other factors. Overly vibrant and uniform green may instead be a sign of Type C.

  • "Burning with fire" identification method: This method is not recommended. Although the polymer in Type B jadeite will blacken or emit an odor when heated, this method can severely damage the jadeite and may also cause damage to Type A.


Practical Tips

  • Look more, buy less: Beginners should visit reputable jewelry stores or jade markets more often to observe and feel different qualities of jadeite, accumulating experience.

  • Request an authoritative appraisal certificate when purchasing: Ensure the certificate clearly states "Natural Jadeite (Type A)" and verify the certificate number with the actual item.

  • Choose reputable merchants: When purchasing jadeite, choose merchants with a good reputation and after-sales service.

  • Carry a magnifying glass: Carry a 10x magnifying glass to help observe the surface structure and internal characteristics of jadeite.

  • Learn professional knowledge: Read relevant books, attend lectures, and continuously improve your identification skills.

  • Comparison method: Compare the jadeite to be identified with known Type A jadeite, looking for differences in luster, color, and tactile sensation.


Conclusion


Identifying Type A, B, and C jadeite is a science that requires systematic learning and practice. By comprehensively utilizing visual inspection, tactile sensation, tapping, UV lamp detection, and other methods, combined with the assistance of professional instruments, the accuracy of identification can be greatly improved. Most importantly, maintain a cautious attitude, do not blindly pursue low prices, choose reputable merchants, and request authoritative appraisal certificates. We hope this tutorial helps you avoid detours on your journey of jadeite appreciation and collection, and acquire your desired natural beautiful jade!