Overview


Jadeite jade, with its warm texture, rich colors, and profound cultural connotations, has been deeply loved by East Asians 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. As a senior jade appraisal expert, I will provide you with a detailed analysis of the identification methods for these three types of jadeite, helping you develop a keen eye to avoid being deceived.

Type A Jadeite: Refers to natural jadeite that has not undergone any chemical treatment, only mechanical processing (cutting, carving, polishing). Its color, structure, and luster are all naturally formed, possessing the highest collection and wearing value.
Type B Jadeite: Refers to jadeite that has been treated with strong acid to remove internal impurities and dirty colors, and then filled with epoxy resin or similar organic glue. Its structure is damaged, and both its luster and durability are inferior to Type A jadeite.
Type C Jadeite: Refers to jadeite that has been artificially dyed, where its color is not naturally formed but permeated into the jadeite through chemical dyes. Type C jadeite usually has overly bright and unnatural colors.
Type B+C Jadeite: Refers to jadeite that has been both acid-treated and dyed, a combination of Type B and Type C, with the poorest quality.

Basic Knowledge


Before delving into the identification methods, we need to understand some basic characteristics of jadeite:
  • Luster: Natural jadeite (Type A) usually exhibits a vitreous to sub-vitreous luster, with a smooth and delicate surface.

  • Structure: Jadeite is a polycrystalline aggregate, composed of countless tiny crystals interwoven internally. This structure is visible under a magnifying glass.

  • Color: The color distribution of natural jadeite is usually uneven, with color roots and color bands, and natural color transitions.

  • Density: Jadeite has a high density, feeling heavy in the hand.

  • Hardness: Jadeite has a Mohs hardness of 6.5-7, which is relatively hard.


Identification Methods (Step-by-Step)


We will explain in detail from four aspects: naked eye observation, magnifying glass observation, UV fluorescence lamp detection, and tapping for sound.

1. Naked Eye Observation Method


This is the most basic and intuitive identification method, suitable for preliminary judgment.

Operating Steps:

  • Observe the Luster: Place the jadeite under natural light and carefully observe its surface luster. Type A jadeite usually exhibits a vitreous luster, with a smooth, bright surface and sharp reflections. Due to acid washing and glue filling, the surface luster of Type B jadeite will appear dull, muted, or even waxy or resinous, with unsharp reflections. The luster of Type C jadeite is similar to Type A, but needs to be judged in conjunction with other characteristics.

* Case Study: A Type A bangle shines brightly in the sunlight, with clear reflections visible on its surface. In contrast, a Type B bangle, no matter how well polished, always feels as if a layer of mist covers its surface, and the luster is not transparent enough.
  • Observe the Color:

* Type A: Color distribution is natural, with color roots and color bands, and natural transitions in color depth. The color will not accumulate in cracks. Even full-green Type A jadeite will have subtle color variations.
* Type B: The color may be relatively uniform, but often appears to “float” on the surface, lacking layering and vibrancy. Sometimes, color accumulation can be seen in acid-etched lines.
* Type C: The color is overly bright, garish, and unnatural, often permeating along cracks or crystal interspaces, forming a reticulated or filamentous color distribution. Under a magnifying glass, color enrichment in cracks or a sponge-like appearance can be observed.
* Case Study: A Type C green jadeite has a 'wicked' green color, as if dyed. Closer inspection reveals the green is particularly concentrated in the cracks, whereas the green in Type A jadeite appears to grow from within, with natural transitions.
  • Observe the Surface:

* Type A: The surface is smooth and delicate, without acid-etched lines or a gummy feel.
* Type B: The surface may have acid-etched lines, known as the “orange peel effect” or “spider web pattern.” This is due to the loosening of the internal structure after acid washing and subsequent shrinkage of the filled glue or differences in expansion coefficients between the glue and jadeite. When touched, the surface may feel uneven and gummy.
* Type C: The surface is usually relatively smooth, but there may be traces of dye accumulation in cracks.
* Image Description: A high-resolution image of a Type A jadeite surface, showing delicate vitreous luster and a smooth surface. A high-resolution image of a Type B jadeite surface, showing obvious “orange peel effect” and depressed acid-etched lines.

2. Magnifying Glass Observation Method (10x or higher)


This is a crucial step for identifying Type B and Type C jadeite, requiring professional tools.

Operating Steps:

  • Observe Internal Structure:

* Type A: Under a 10x magnifying glass, the internal fibrous intergrowth structure of the jadeite can be seen, with clear crystal grains and a compact structure. Natural cotton, veins, and cracks may sometimes be visible.
* Type B: Due to acid washing, the internal structure is damaged, and the connections between crystal grains become loose, even appearing as reticulated cracks filled with glue. Under a magnifying glass, these glues appear as turbid, waxy, or resinous fillers, and sometimes air bubbles can be seen.
* Type C: The internal structure is similar to Type A, but color will be found permeating along crystal interspaces or cracks, appearing as reticulated, filamentous, or dotted distributions. The color is unnatural, and color may be enriched in cracks.
* Image Description: A microstructural image of Type A jadeite under a 10x magnifying glass, showing clear crystal grains and a compact structure. A microstructural image of Type B jadeite under a 10x magnifying glass, showing obvious reticulated acid-etched lines, filled glue, and small air bubbles.
  • Observe “Fly Wings”:

* Type A: Under light, when rotating the jadeite, shimmering flaky reflections may sometimes be seen on the surface or internally. These are reflections from the internal cleavage planes of the jadeite at specific angles, commonly known as “fly wings.” Type A “fly wings” are usually clear and natural.
* Type B: Due to acid washing and glue filling, “fly wings” may be indistinct or obscured by the glue, appearing blurry.

3. UV Fluorescence Lamp Detection Method


Utilize UV light to observe if the jadeite emits fluorescence.

Operating Steps:

  • Prepare Tools: Use a professional UV fluorescence lamp (long-wave UV and short-wave UV).

  • Irradiate and Observe: Place the jadeite in a dark room and irradiate it with the UV fluorescence lamp.

* Type A: Most Type A jadeite shows no fluorescence reaction under UV light, or only a weak inert fluorescence.
* Type B: Due to the epoxy resin and other organic glues emitting strong fluorescence (usually blue or yellow-green) under UV light, Type B jadeite will show an obvious fluorescence reaction under UV light. Fluorescence is more pronounced under long-wave UV.
* Type C: Type C jadeite itself may not have fluorescence, but if the dye contains fluorescent substances, or if Type C is B+C, fluorescence may also appear.
* Case Study: A seemingly perfect jadeite bangle emits a faint blue light under UV light, which almost certainly indicates it is Type B.

4. Tapping for Sound Method (Use with caution, for reference only)


This method carries some risk and may damage the jadeite. It is recommended to attempt it under the guidance of a professional or on low-value samples.

Operating Steps:

  • Gently Tap: Gently tap the jadeite to be identified with a coin or another piece of jadeite.

* Type A: The sound is crisp and pleasant, with a metallic clarity.
* Type B: Due to the loose internal structure and glue filling, the sound will appear dull, muffled, and lack crispness.
* Case Study: Two jadeite pieces of similar size and shape, one produces a crisp tapping sound, while the other produces a dull sound. The latter is likely Type B.

Common Misconceptions


  • “Certificate is omnipotent”: While certificates are important references, not all certificates are reliable. Be sure to choose certificates issued by nationally recognized authoritative appraisal institutions and verify that the information on the certificate matches the actual item. Some unscrupulous merchants may use fake certificates or reuse one certificate for multiple items.

  • “The greener, the better”: While vibrant color is important, natural green often has color roots and color bands, with natural transitions. Overly uniform, unnaturally vibrant green should raise suspicion of Type C jadeite.

  • “The fewer flaws, the better”: Natural Type A jadeite will more or less have some natural flaws such as cotton, veins, and cracks, which are manifestations of its naturalness. Pursuing flawless perfection can easily lead to falling into the trap of Type B jadeite, as Type B can remove most impurities and flaws through acid washing.

  • “Low price”: Jadeite is a scarce resource, and high-quality Type A jadeite is expensive. If you encounter a “good deal” whose price is far below market value, be sure to be vigilant.


Practical Tips


  • Look more, buy less: Before purchasing jadeite, visit more reputable jewelry stores and museums, observe more real items, accumulate experience, and develop an “eye” for jadeite.

  • Start with the simple: Beginners can start by identifying Type A and Type B jadeite. Identifying Type C is relatively more difficult and requires more experience.

  • Request an authoritative certificate when purchasing: When purchasing high-value jadeite, always ask the merchant for an appraisal certificate issued by authoritative institutions such as the National Gemstone Testing Center (NGTC) or the Gemological Institute of China University of Geosciences (Wuhan).

  • Comparison method: If conditions permit, observe a confirmed Type A jadeite and a suspected Type B/C jadeite simultaneously for comparison. The differences will be more apparent.

  • Utilize professional tools: A 10x magnifying glass and a UV fluorescence lamp are powerful tools for identifying Type B and Type C jadeite. Enthusiasts with conditions are advised to purchase them.

  • Learn professional knowledge: Read professional jadeite appreciation books and attend relevant lectures to continuously improve your professional knowledge.


Conclusion


Jadeite identification is a science that requires a combination of theoretical knowledge and practical experience. Identifying Type A, B, and C jadeite is not an overnight task; it requires repeated practice and meticulous observation. Through the detailed explanation in this article, I believe you have gained a preliminary understanding of jadeite identification. Remember, observe more, compare more, learn more, and utilize professional tools and authoritative certificates to navigate the world of jadeite with ease and discover true treasures.

Disclaimer: The identification methods provided in this article are for reference only and do not constitute any purchase advice. When purchasing high-value jadeite, it is strongly recommended to seek assistance from a professional appraisal institution.