Overview


Jadeite jade, with its unique warm luster, rich colors, and profound cultural heritage, has been deeply loved by Eastern nations since ancient times, hailed as the "King of Jade." However, with the growth of market demand and the advancement of processing technology, a large number of jadeites that have undergone varying degrees of treatment, namely Type B, Type C, and even Type B+C goods, have appeared on the market. These treated jadeites not only significantly depreciate in value but may also pose potential health risks to wearers. As a senior jade appraisal expert, I will, through this tutorial, simply and profoundly reveal the secrets of identifying Type A, B, and C jadeite jade, helping you develop a "piercing eye" to distinguish authenticity and quality in the complex jadeite market.

Basic Knowledge


Before delving into the identification methods, we first need to understand the definitions of Type A, B, and C jadeite jade and their causes.

* Type A Jadeite (Natural Jadeite): Refers to natural jadeite that has not undergone any chemical treatment, only mechanical processing (such as cutting, grinding, polishing). Its color, structure, and texture are naturally formed, possessing natural physical and chemical properties. Type A jadeite has collection and wearing value.
* Type B Jadeite (Resin-filled Jadeite): Refers to jadeite that has been soaked in strong acid to remove internal impurities and dirt, and then injected with transparent resin (such as epoxy resin) for filling and consolidation. The purpose is to improve the transparency, luster, and clarity of the jadeite. The structure of Type B jadeite has been damaged, and its stability is poor. Long-term wear may cause discoloration, yellowing, and even skin allergies.
* Type C Jadeite (Dyed Jadeite): Refers to colorless or light-colored jadeite that has been artificially dyed to present vivid colors, masquerading as high-grade jadeite. Dyes are usually organic dyes or inorganic pigments. The color of Type C jadeite floats on the surface, is unnatural, and may contain chemicals harmful to the human body.
* Type B+C Jadeite: Refers to jadeite that has undergone both strong acid treatment and artificial dyeing, combining the disadvantages of both Type B and Type C goods, making it the lowest quality jadeite on the market.

Identification Methods (Step-by-Step)


We will detail the identification methods for Type A, B, and C goods from multiple dimensions, including visual observation, tactile feel, sound, magnified observation, and UV fluorescence lamp detection.

Step One: Visual Observation – Macroscopic Features


This is the most direct and basic identification method, requiring meticulous observation.

  • Observe Luster:

* Type A Jadeite: Typically exhibits vitreous luster or sub-vitreous luster, with a smooth and delicate surface, uniform and bright reflection, and a sense of "rigidity" or "fluorescence" (not true fluorescence, but a visual effect formed by light reflecting and refracting between internal crystals of the jadeite).
* Type B Jadeite: Due to resin filling, its luster often appears waxy, resinous, or gelatinous. The surface is usually not smooth, and the reflection appears dull, turbid, or even has a "greasy luster" (an unnatural, overly oily luster).
* Type C Jadeite: Luster is similar to Type A, but the color is often too vivid and unnatural, and may be accompanied by the gelatinous luster of Type B goods.
* Case Study: Compare a natural Type A jadeite bangle with a Type B jadeite bangle. The Type A bangle's surface is as smooth as a mirror, with light reflecting fluidly; the Type B bangle's surface may appear somewhat hazy, with less sharp reflections, and even subtle depressions or unevenness visible at certain angles.

  • Observe Color:

* Type A Jadeite: Color is natural, layered, with obvious "color roots" (darker spots or lines that gradually spread outwards), and uneven color distribution with natural transitions from deep to shallow. Even for full-green jadeite, its color often has subtle variations in shade.
* Type B Jadeite: Although the color may be vivid, it often appears restless and unnatural, without color roots, and the color distribution is uniformly unreal. Sometimes, color distribution along cracks can be observed.
* Type C Jadeite: Color is overly vivid and dazzling, lacking the natural vibrancy of natural jadeite. The color often floats on the surface, appearing as a net-like, thread-like, or patchy distribution with blurred edges. The color will deepen in cracks, depressions, or intergranular spaces, forming a characteristic of "color enrichment along cracks." Wiping with an alcohol-soaked cotton swab may sometimes cause color fading (but this method is not recommended for jadeite of uncertain authenticity, to avoid secondary damage).
* Case Study: A natural full-green jadeite pendant has a green color with varying depths, as if flowing; a dyed Type C jadeite pendant has a green color that appears like painted pigment, stiff and uniform, and under magnification, color accumulation in intergranular spaces can even be seen.

  • Observe Structure:

* Type A Jadeite: The internal crystal structure is compact, with visible "fly wings" (also known as "cangyingchi," which are flaky flashes on the cleavage planes of jadeite under light) or "orange peel effect" (uneven raised and depressed areas on the polished surface, resembling orange peel).
* Type B Jadeite: Due to strong acid soaking destroying the crystal structure and subsequent resin filling, its surface often exhibits "acid-etched network patterns" or "spiderweb patterns," meaning fine net-like or linear depressions are visible on the surface under magnification. The internal structure is loose, and fly wings are not obvious or even absent. Under transmitted light, flocculent or clumpy resin may sometimes be observed internally.
* Type C Jadeite: Structural characteristics are similar to Type B, also showing acid-etched network patterns.
* Case Study: Place the jadeite under strong light and observe with the naked eye or a magnifying glass. Type A jadeite shows tightly arranged crystal grains, occasionally flashing "fly wings"; Type B jadeite may show fine net-like patterns on the surface, as if corroded.

Step Two: Tactile Feel – Touch Experience

  • Coolness:

* Type A Jadeite: Due to its density and thermal conductivity, it feels distinctly cool to the touch, and this coolness lasts for a period.
* Type B Jadeite: Due to the poor thermal conductivity of resin, the coolness to the touch is less pronounced than Type A, and the coolness dissipates quickly.
* Type C Jadeite: Tactile feel is similar to Type B.
* Case Study: Hold a Type A bangle and a Type B bangle separately. The Type A bangle will feel cooler and the coolness will last longer.

  • Smoothness:

* Type A Jadeite: After grinding and polishing, the surface feels very smooth and oily (not greasy from oil), as if oil is attached to it.
* Type B Jadeite: Due to the possible presence of acid-etched network patterns and resin filling on the surface, the tactile feel is relatively dry and less smooth.

Step Three: Sound – Tapping Identification (Proceed with Caution)

  • Crispness:

* Type A Jadeite: Gently tapping two pieces of Type A jadeite will produce a crisp, pleasant, long-lasting metallic or glassy sound. This is due to its dense internal structure and good vibration conductivity.
* Type B Jadeite: Due to the internal structure being damaged and filled with resin, the tapping sound will be dull, hoarse, or even a "clack-clack" plastic sound.
* Type C Jadeite: Sound is similar to Type B.
* Procedure: Suspend the jadeite with a thin string and gently tap it with another coin or another piece of jadeite (ensuring it is Type A). Caution: This method carries some risk and is not recommended for beginners, especially for valuable or fragile jadeite. Do not attempt it easily to avoid damage.

Step Four: Magnified Observation (10x or 20x) – Microscopic World


This is a crucial step in professional appraisal, revealing details imperceptible to the naked eye.

  • Observe Surface:

* Type A Jadeite: The surface is smooth and flat, with uniform polishing marks, and "orange peel effect" or "fly wings" may be visible.
* Type B Jadeite: Obvious "acid-etched network patterns," "spiderweb patterns," or "crazing" may be visible on the surface. These patterns are depressions formed after strong acid corrosion, then filled with resin. At certain angles, the boundary between the resin filler and the jadeite body, or depressions formed by resin overflow or shrinkage, can be seen.
* Type C Jadeite: Surface characteristics are similar to Type B, also showing acid-etched network patterns.
* Case Study: Under a 10x magnifying glass, observe a Type B bangle. Its surface is like dried mud, covered with fine cracks and depressions, which are typical acid-etched network patterns.

  • Observe Color Distribution:

* Type A Jadeite: Color is naturally distributed within or between crystal grains, with color roots and natural transitions.
* Type C Jadeite: Under magnification, color often accumulates along intergranular spaces, cracks, or depressions, forming net-like, dot-like, or patchy dyeing marks. Sometimes, dye accumulation can be seen, and the color appears unnatural and uneven.
* Case Study: Use a magnifying glass to observe the green part of Type C jadeite. You will find that the green color is concentrated at the edges of the crystal grains or in cracks, rather than uniformly penetrating the entire crystal.

Step Five: UV Fluorescence Lamp Detection – Technology Assisted


UV fluorescence lamps are effective tools for identifying Type B jadeite.

  • Fluorescence Reaction:

* Type A Jadeite: Under long-wave and short-wave ultraviolet light, there is usually no fluorescence reaction or only a weak inert fluorescence (e.g., pale green, pale blue).
* Type B Jadeite: Due to the resin filler usually containing fluorescent agents, it will exhibit obvious blue, blue-white, or yellow-green fluorescence under long-wave ultraviolet light. The fluorescence intensity is related to the type and content of the resin.
* Type C Jadeite: If not resin-filled, usually no fluorescence; if it is Type B+C, it will show the fluorescence reaction of Type B goods.
* Procedure: Place the jadeite in a dark room and illuminate it with a long-wave UV fluorescence lamp. Observe whether it emits fluorescence. Note: Not all Type B jadeite will have strong fluorescence. Some Type B goods with better treatment techniques may have inconspicuous fluorescence, so fluorescence reaction alone cannot be used as the sole basis for judgment.
* Case Study: A jadeite bangle that looks normal under ordinary light emits a faint blue fluorescence under a UV lamp, which almost certainly identifies it as Type B.

Common Misconceptions

  • Are "cotton" and "veins" always Type B?: "Cotton" (white flocculent inclusions) and "veins" (natural cracks or growth lines) in jadeite are common characteristics of natural jadeite, not signs of Type B goods. Type A jadeite can also have cotton and veins, but its structure is complete and will not have acid-etched network patterns.

  • Is brighter color always better?: While the vividness of natural jadeite's color is directly proportional to its value, overly vivid, unnatural colors may be a sign of Type C goods.

  • Is cheap price always Type B?: Although Type B and Type C goods are much cheaper than Type A, there are also cases in the market where inferior goods are sold at high prices, passing off Type B and Type C as Type A. Price is only a reference factor and cannot be the sole criterion for identification.

  • Is a certificate foolproof?: Certificates issued by reputable and authoritative institutions are important references, but beware of fake certificates or non-standard certificates issued by small institutions. When purchasing, it is best to choose a reputable merchant and request a certificate from a national or provincial authoritative institution.

  • Attention to detail: Jadeite identification often lies in the details. Patient and meticulous observation is key to success.


Practical Tips

  • Observe and Compare More: Observe more genuine Type A jadeite to accumulate experience and form a "memory" of Type A luster, color, and structure.

  • Utilize Tools: Carry a 10x magnifying glass and a small UV fluorescence lamp for preliminary inspection when purchasing.

  • Seek Professional Help: For uncertain jadeite, be sure to seek appraisal from a professional jewelry appraisal institution.

  • Purchase Channels: Choose reputable merchants with legitimate business qualifications to purchase jadeite, avoiding purchases from tourist attractions, street vendors, etc.

  • Focus on Details: Jadeite identification often hides in the details; patient and meticulous observation is the key to success.


Conclusion


Identifying Type A, B, and C jadeite jade is a science that requires the comprehensive application of various methods and practical experience. Visual observation, tactile feel, sound, magnified observation, and UV fluorescence lamp detection are the main identification techniques. Remember, Type A jadeite has a natural warm luster, naturally vibrant colors, and a dense internal structure; Type B jadeite is often accompanied by waxy luster, acid-etched network patterns, and fluorescence reaction; Type C jadeite is characterized by its unnatural color floating on the surface. I hope this tutorial can provide strong assistance on your jade appraisal journey, allowing you to appreciate the beauty of jadeite while also having the discerning eye to avoid being deceived. May you find your coveted treasures in the world of jadeite!