Dyed jadeite is jadeite jade that has been treated with synthetic colourants — most commonly green or lavender dyes — to introduce or intensify colour in material that would otherwise be pale, uneven, or commercially unattractive. In the trade, dyed jadeite is classified as C-jade when dyeing alone has been applied, or B+C jade when dyeing is combined with bleaching and polymer impregnation. Both categories represent significant departures from natural-colour jadeite and must be disclosed at every level of the supply chain. Because high-quality natural jadeite — particularly the intensely green Imperial grade from Myanmar — commands prices rivalling fine rubies and sapphires, the economic incentive to simulate those colours through treatment is considerable. Detection requires laboratory-grade instrumentation, and undisclosed dyed jadeite remains one of the more consequential misrepresentation issues in the Asian gem trade.

The Treatment Hierarchy: A, B, and C Jade

The informal alphabetical classification of jadeite by treatment status originated in the Hong Kong and Chinese trade and has become widely understood across gemmological laboratories and auction houses.

• A-jade — untreated jadeite, retaining its natural colour, structure, and surface wax coating (a traditional and accepted finish). No bleaching, no polymer, no dye.
• B-jade — jadeite that has been bleached in acid to remove brown iron-staining and then impregnated with a colourless polymer (typically epoxy or paraffin) to restore structural integrity. Colour is not artificially introduced, but the natural colour distribution may be altered.
• C-jade — jadeite to which synthetic dye has been applied, with or without prior bleaching. The dye penetrates fractures, grain boundaries, and surface irregularities.
• B+C jade — the combination treatment: acid bleaching, polymer impregnation, and dyeing. This is the most heavily processed category and the most difficult for an untrained eye to identify.

The distinction matters enormously in valuation. A fine A-jade cabochon of Imperial green colour may sell for tens of thousands of dollars per carat at auction; an equivalent-looking B+C piece is worth a small fraction of that figure, reflecting its treated and structurally compromised nature.

How Dyeing Is Performed

Jadeite destined for dyeing is typically low-grade material — heavily fractured, bleached of its original colour by acid treatment, or naturally pale. The bleaching process (using hydrochloric or oxalic acid) opens the microstructure, creating pathways along which dye can later be introduced. The stone is then immersed in or painted with organic dye solutions, most commonly chromium-based greens or synthetic violet and purple dyes for lavender imitation. Heat may be applied to drive the dye deeper into the fracture network. A polymer impregnation step frequently follows to seal the dye within the stone and restore surface lustre.

The resulting colour can be visually convincing to an untrained observer, particularly under the warm lighting conditions common in retail settings. However, the dye is not chemically bonded to the jadeite crystal lattice and will fade, bleed, or shift over time — especially with exposure to heat, solvents, or prolonged ultraviolet radiation. This inherent instability is one of the practical, as well as ethical, reasons that disclosure is mandatory.

Gemmological Detection

Identifying dyed jadeite is a multi-technique exercise. No single test is conclusive in isolation, but the combination of the following methods provides reliable identification:

• Magnification — Under a loupe or gemological microscope, dye concentrations are visible as colour pooling along fractures, grain boundaries, and surface irregularities. The colour distribution in dyed material is characteristically uneven, following structural pathways rather than being tied to the crystal chemistry. Natural jadeite colour, by contrast, tends to occur in irregular patches, veins, or clouds that are unrelated to fracture networks.
• Chelsea colour filter — Green dyes used in C-jade often transmit red through the Chelsea filter, whereas natural chromium-coloured Imperial jadeite also appears red. This test is therefore suggestive but not definitive on its own.
• UV fluorescence — Dyed jadeite frequently shows an uneven or anomalous fluorescence response under long-wave ultraviolet light, particularly where polymer is present. Polymer itself may fluoresce bluish-white, an indicator of B or B+C treatment.
• Infrared spectroscopy (FTIR) — The most reliable instrumental method. Polymer impregnation produces characteristic absorption bands in the infrared spectrum — notably around 2800–3000 cm⁻¹ — that are absent in untreated jadeite. FTIR is the standard confirmatory test used by the Gemmological Institute of America (GIA), the Hong Kong Jade and Stone Laboratory, and other major Asian laboratories.
• Raman spectroscopy — Can identify specific dye compounds and polymer types, providing additional confirmation and, in some cases, characterising the precise colourant used.

GIA's Gem Encyclopedia and laboratory reports note that the detection of dyeing in jadeite is well-established using these methods, and GIA issues reports that explicitly state whether a jadeite specimen is natural colour (A-jade), polymer-impregnated (B-jade), or dyed (C-jade or B+C jade).

Market Context and Disclosure Requirements

The jade market is centred principally in Hong Kong, mainland China, Taiwan, and Myanmar, with significant secondary markets in Singapore, Japan, and among diaspora communities worldwide. In these markets, the distinction between A-jade and treated categories is culturally and commercially fundamental. Buyers at the top of the market — auction houses such as Sotheby's and Christie's, and specialist dealers — require laboratory certification from recognised institutions before offering jadeite at significant prices.

Disclosure of dyeing is legally required in most jurisdictions under consumer protection and trade description legislation, and is mandated by the codes of practice of major gemmological organisations. The International Colored Gemstone Association (ICA) and AGTA both classify dyeing as a treatment requiring full disclosure. Despite this, undisclosed dyed jadeite continues to circulate, particularly in tourist markets, informal retail settings, and online platforms where laboratory verification is absent.

The value differential is stark. Natural-colour jadeite of fine quality — particularly translucent Imperial green or rich lavender — is among the most valuable gem material sold in Asia. Dyed jadeite, regardless of its visual appearance, is priced as a treated commodity. At auction, a single A-jade bangle of fine Imperial colour has sold for millions of dollars; comparable-looking B+C bangles are traded in wholesale lots for a few dollars each.

Consumer Guidance

Any jadeite purchase at meaningful price levels should be accompanied by a laboratory report from a recognised institution. The GIA, the Hong Kong Jade and Stone Laboratory, the Gemmological Association of All Japan (GAAJ), and Lotus Gemology in Bangkok are among the laboratories whose reports are respected by the trade. A report confirming "no indications of impregnation or dyeing" — or equivalent language — is the baseline assurance for A-jade status. Buyers should be particularly cautious of intensely and uniformly coloured green or lavender jadeite offered without documentation, as these are the colours most commonly targeted by dyeing treatments.

Further Reading

• GIA — Jadeite Jade Treatments and Detection
• GIA Gem Encyclopedia — Jadeite Jade
• Lotus Gemology — Jadeite Treatments
• AGTA — Gemstone Treatment Disclosure