A-jade — known in the Chinese trade as A-huo or simply natural jadeite — is jadeite jade that has received no chemical treatment beyond a thin application of surface wax. It represents the highest tier in the three-part classification system that the jadeite trade developed to distinguish untreated material from polymer-impregnated B-jade and dyed C-jade. Because jadeite's value is exquisitely sensitive to colour, translucency, and structural integrity, the A-jade designation carries profound commercial significance: comparable pieces of A-jade routinely command two to ten times the price of their treated counterparts, and at the finest end of the market — imperial green, highly translucent material from Myanmar — the premium can be far greater still.

Origins of the Classification System

The A/B/C grading terminology emerged from the Hong Kong and Guangzhou jadeite trade during the latter decades of the twentieth century, a period in which polymer-impregnation treatments became widespread enough to threaten consumer confidence. Dealers and gemmological laboratories adopted the lettered system as a shorthand that could be communicated quickly across language barriers in auction rooms and wholesale markets. The letters do not correspond to a formal quality scale in the manner of diamond grading; rather, they denote treatment status alone. A-jade is not necessarily superior in colour or texture to B-jade — it is simply untreated. A piece of pale, heavily fractured A-jade may be worth less than a well-coloured B-jade bangle in a purely aesthetic sense, yet the A designation remains the commercial and ethical baseline that serious collectors and institutions demand.

What A-Jade Permits — and What It Prohibits

The single enhancement permitted under the A-jade designation is surface waxing. Historically, jade carvers and polishers have applied a thin coat of natural wax — traditionally beeswax or carnauba wax — to freshly polished jadeite surfaces to seal minor surface irregularities and impart a subtle, even lustre. This practice is considered analogous to oiling a fine wooden instrument: it is a surface treatment of negligible depth that does not alter the stone's internal structure, colour, or chemical composition. GIA and other accredited laboratories accept surface waxing as consistent with the A-jade designation, provided the wax penetration is superficial.

What A-jade explicitly excludes is any of the following:

• Bleaching: Immersion in acid solutions (typically hydrochloric or oxalic acid) to remove brown iron-oxide staining from the intergranular spaces of the jadeite aggregate. Bleaching weakens the stone's matrix and is the preparatory step for polymer impregnation.
• Polymer impregnation: Infilling of the porous, acid-leached matrix with epoxy resin or similar polymers to restore apparent translucency and structural cohesion. This defines B-jade.
• Dyeing: Introduction of organic or inorganic colorants — most commonly green dyes — into the stone's fractures or intergranular spaces. Dyed material, with or without impregnation, is classified as C-jade.
• Coating: Application of coloured lacquers or films to the surface, a practice occasionally encountered on lower-quality commercial goods.

Gemmological Identification

Distinguishing A-jade from treated material is one of the more demanding tasks in practical gemmology, and it is the primary reason that laboratory certification has become effectively mandatory for significant jadeite transactions. Several analytical approaches are employed:

• Infrared spectroscopy (FTIR): The most reliable screening tool. Polymer impregnants produce characteristic absorption bands in the infrared spectrum — typically in the 2800–3000 cm⁻¹ region for epoxy resins — that are absent in untreated jadeite. GIA's Gem Testing Laboratory and major Asian laboratories including the Gemmological Association of Hong Kong (GAHK) and the Thailand Institute of Gemological Sciences (TIGS) rely heavily on FTIR for A/B determination.
• Ultraviolet fluorescence: Many polymer-impregnated jadeites fluoresce a chalky or patchy blue-white under long-wave ultraviolet light, whereas untreated jadeite typically shows inert or very weak fluorescence. This is a useful screening indicator but is not definitive, as some natural resins and surface waxes can also produce fluorescence.
• Surface examination under magnification: Bleached and impregnated jadeite frequently displays a network of fine surface cracks — the legacy of acid treatment — sometimes described as a "web" or "crackled" texture. Untreated jadeite surfaces, when examined under oblique illumination, show the characteristic interlocking granular texture of the jadeite aggregate without this secondary fracture network.
• Refractive index and specific gravity: Polymer impregnation lowers the specific gravity of jadeite slightly below the natural range of approximately 3.30–3.36 g/cm³, though the difference can be subtle and is not always diagnostic on its own.

Laboratory Certification

For any jadeite piece of material commercial value, a certificate from an accredited laboratory specifying treatment status is the industry standard. GIA certificates for jadeite jade state whether the material shows "no indications of impregnation" — the laboratory's phrasing for A-jade — or identify the presence of polymer or dye. The Gübelin Gem Lab in Lucerne and SSEF Swiss Gemmological Institute in Basel issue comparable reports for the international market. In Hong Kong and mainland China, the GAHK and the National Gemstone Testing Centre (NGTC) are widely accepted authorities. Certificates do not use the letter grades A, B, or C directly in their formal language — the trade shorthand is not official laboratory terminology — but the conclusions they state map directly onto those categories.

It is worth noting that laboratory certification addresses treatment status at the time of testing. Surface wax, being a permitted enhancement, is not flagged as a treatment on certificates. However, if a stone is subsequently re-waxed heavily or coated after certification, the certificate no longer accurately represents the stone's condition.

Market Context and Pricing

The jadeite market is centred on Hong Kong, which functions as the primary international trading hub, with significant activity in Guangzhou, Taipei, and increasingly Singapore. At major auction houses — Christie's, Sotheby's, and Poly Auction among them — top-quality A-jade in imperial green commands prices that place it among the most valuable coloured gemstone materials by weight. The benchmark colour is a vivid, even, slightly bluish green of high saturation and strong translucency, known in the trade as feicui of the finest grade. A-jade bangles of this quality have achieved prices exceeding one million US dollars per piece at auction.

At the middle and lower market levels, the A-jade premium over treated material remains substantial but more variable. Lavender, white, and mottled green A-jade — commercially important categories in their own right — trade at multiples of their B-jade equivalents when translucency and carving quality are comparable. The premium reflects not only rarity but also the irreversibility of bleaching: once jadeite has been acid-treated, its structural integrity is permanently compromised, and no subsequent process can restore it to A-jade status.

Source Material

Virtually all gem-quality jadeite originates from the Hpakant (Hpakan) mining area in Kachin State, northern Myanmar, the world's dominant source of fine jadeite. Smaller quantities of jadeite are found in Guatemala, Japan (Itoigawa), Kazakhstan, and Russia, but none of these localities produces material that competes with Burmese jadeite at the top of the market. The geological conditions at Hpakant — jadeite formed under high-pressure, relatively low-temperature metamorphic conditions within a subduction zone — yield the interlocking, fine-grained texture that produces the translucency prized in the finest A-jade.

Further Reading

• GIA — Jadeite Jade Treatments
• GIA Gem Encyclopedia — Jadeite Jade
• AGTA — Jade