Jade Treatment Types

Understanding jade treatments is essential for making informed purchases. This guide covers the four main treatment categories, how to detect them, and what they mean for value and durability.

Type A — Natural

A-Jade

Natural, untreated jadeite that has only been cut, polished, and may have a thin wax surface coating (traditional practice).

Process

No chemical treatments applied. The stone is cut, shaped, and polished. A thin surface wax coating is considered acceptable under industry standards (LMHC) and does not alter the stone's structure or colour.

Detection Methods

LMHC: 'No indications of impregnation' on lab report
FTIR shows no polymer absorption peaks at ~2900 cm⁻¹
Natural Cr/Fe absorption lines in visible spectroscopy
No dye concentrations along fractures under magnification

Durability

Excellent long-term stability. Natural jadeite is extremely durable (6.5-7 Mohs) and retains its beauty indefinitely with proper care.

Value Impact

Commands the highest prices. Only Type A is considered investment-grade jade. Fine Imperial Green Type A jadeite can reach prices comparable to top-grade diamonds.

Red Flags

Claims of 'Type A' without a laboratory certificate
Price significantly below market rate for stated quality
Seller refuses to provide lab documentation

Lab Terminology

LMHC: 'No indications of impregnation.' GAHK: 'Fei Cui (Type A).' GIA: 'Natural Jadeite Jade — no indications of treatment.'

Type B — Bleached and Impregnated

B-Jade

Chemically bleached to remove brown staining, then impregnated with polymer resin to fill voids and improve transparency.

Process

A two-step process: (1) Chemical bleaching with strong acids removes brown iron-oxide staining and some darker mineral inclusions, leaving voids and weakened structure. (2) Polymer impregnation fills these voids with resin (typically epoxy or similar), restoring apparent transparency and structural integrity. The classic GIA study documents this as the most commercially significant jade treatment.

Detection Methods

FTIR: Definitive — strong absorption group around ~2900 cm⁻¹ (C-H stretching from polymer)
Magnification: 'Orange peel' surface texture, etched grain boundaries
UV fluorescence: Often bluish-white to yellowish-green (from polymer)
SG: May be slightly lower than expected (~below 3.32)
Sound test: Large pieces may sound more muffled than untreated (unreliable for small items)

Durability

Poor long-term stability. Polymer can yellow, become cloudy, or crack over 5-10 years. Exposure to heat, chemicals, or UV light accelerates degradation. The stone may develop a 'sweaty' appearance as polymer breaks down.

Value Impact

Dramatically lower value than Type A — typically 5-20% of equivalent natural piece. Not considered investment-grade. Should always be disclosed to buyers.

Red Flags

Unusually uniform transparency with low price
Bluish-white UV fluorescence throughout
'Too perfect' appearance with suspiciously low price
Seller claims 'natural' but cannot provide FTIR-confirmed lab report

Lab Terminology

LMHC: 'Indications of bleaching and impregnation with near-colourless resin/wax.' GAHK: 'Fei Cui (Type B).' GIA: 'Jadeite Jade — bleached and polymer impregnated.'

Type C — Dyed

C-Jade

Colour-enhanced by introducing dye into the stone, often concentrated along fractures and grain boundaries.

Process

Coloured dye agents are introduced into the stone's fractures and grain boundaries to enhance or change colour. The dye may be organic or inorganic. Some stones are also bleached first to create pathways for better dye penetration. Dyeing can simulate Imperial Green, Lavender, or other high-value colours.

Detection Methods

Magnification: Colour concentrations along fractures and grain boundaries
Visible spectroscopy: Broad, diffuse absorption bands (dye) vs sharp Cr/Fe lines (natural)
Chemical analysis: Minimal or no chromium despite vivid green colour
Chelsea colour filter: May show different reaction than natural green
SSEF casework has documented dye-induced colour with near-zero chromium content

Durability

Variable but generally poor. Dye can fade with exposure to light, heat, or chemicals. Some modern dyes are more stable, making detection harder but degradation still occurs over time.

Value Impact

Very low value. Dyed jade should be priced as decorative material only, not as natural gemstone-grade jade. Must always be disclosed.

Red Flags

Vivid colour concentrated in fractures visible under magnification
Colour appears 'painted on' rather than emanating from within
No chromium signature in spectroscopy despite green colour
Price too low for the apparent colour quality

Lab Terminology

LMHC: 'Indications of dyeing — coloured agents fill fissures/fractures.' GAHK: 'Fei Cui (Type C).' GIA: 'Jadeite Jade — dyed.'

Type B+C — Bleached, Impregnated, and Dyed

B+C Jade

The most heavily treated category: bleached, polymer-impregnated, and dyed. Combines the risks of both Type B and Type C.

Process

The stone undergoes chemical bleaching (removing natural colour and staining), followed by dyeing (introducing artificial colour), and polymer impregnation (filling voids with resin). This triple treatment can transform low-grade material into something resembling fine jade. It is the most deceptive treatment combination.

Detection Methods

FTIR: Polymer absorption at ~2900 cm⁻¹ (same as Type B)
Magnification: Dye concentrations in fractures + 'orange peel' texture
Visible spectroscopy: Dye absorption bands + no natural Cr/Fe lines
UV fluorescence: Polymer-related fluorescence + possible dye fluorescence
Combined evidence from multiple tests provides the strongest conclusion

Durability

Poorest of all treatment types. Subject to both polymer degradation (yellowing, cracking) and dye fading. The most likely to deteriorate visibly within years.

Value Impact

Minimal value — decorative material only. Should be priced accordingly and always fully disclosed. Selling B+C jade as natural constitutes fraud in most jurisdictions.

Red Flags

All red flags of both Type B and Type C apply
Unusually vivid colour combined with unusual transparency at a low price
Seller is vague about treatment status or avoids discussing lab reports
Material appears 'too good to be true' for its price point

Lab Terminology

LMHC: 'Indications of bleaching, impregnation, and dyeing.' GAHK: 'Fei Cui (Type B+C).' GIA: 'Jadeite Jade — bleached, polymer impregnated, and dyed.'

Additional Treatment

Coating

Surface Treatment

A surface layer applied to improve colour or transparency and conceal features. GIA documented that coatings can significantly alter apparent quality while being difficult to detect without instrumentation.

Detection Methods

Low hardness of coating layer (scratches more easily)
Lower RI on coated surface vs uncoated areas
Fluorescence differences under specialised UV imaging
Polymer/organic signatures in FTIR and Raman
Coated jadeite may feel warmer due to coating thermal properties

Key Takeaway

FTIR (Fourier-Transform Infrared Spectroscopy) is the definitive test for distinguishing natural Type A jade from treated material. Polymer absorption peaks at approximately 2900 cm⁻¹ are the gold standard for detecting bleaching and impregnation. Never rely on visual inspection alone — always request FTIR-confirmed laboratory certification before purchasing high-value jadeite.