On this page
UnderstandWhat it is, what people ask, how far this page goes
Natural inorganic gem materials · Trade name: colour / appearance variety · Treated: dyed
Dyed Agate
Chalcedony or agate that has been dyed. Most blue, green, pink and purple agate on the market falls into this category, and the name must state that it is dyed. This page compares how the major standards and institutions name it, what must be disclosed when selling it, whether it can be worn every day, how it is treated and identified, and which source each conclusion comes from.
Price, rarity and origin are outside the scope of this wiki.
Questions people ask about Dyed Agate
Every sentence below is followed by the registered fact it rests on; answers add no new facts and promise no outcome.
Q1How can you tell if agate has been dyed?
Under magnification the colour of dyed agate is uneven and mostly concentrated in fissures, between grains or in surface hollows.GB/T 16553—2017Colour and banding by themselves do not show whether the hue is natural or produced by dyeing or heating, so a reliable call needs instrumental examination.G&G Summer 2014 · CIBJO Gemstone Book 2022Whether one particular bead is natural, treated or synthetic — only a laboratory report can settle that.What this page can answer
Q2Is dyed agate still real agate?
Dyeing means introducing a dye or stain to change a material's colour, so dyed agate is a treated product rather than natural, untreated agate.CIBJO Gemstone Book 2022It is made by applying a dye to natural chalcedony or agate, so the base material is natural but the colour is not formed in nature.CIBJO Gemstone Book 2022 · G&G Spring 2020
Q3Is dyed agate coloured all the way through?
Not necessarily: the dye becomes concentrated at the surface and decreases inward, giving a colour band from the surface toward the centre.G&G Spring 2020In quench-crackled dyed chalcedony the dyed zones sit at the surface along fractures that reach it.G&G Summer 2020 · CIBJO Gemstone Book 2022
Q4Is bright blue agate or blue chalcedony dyed?
Dyed chalcedony is commonly used to imitate blue chalcedony coloured by chrysocolla, and such pieces have been submitted to laboratories as natural blue chalcedony.G&G Spring 2020Chalcedony dyed with copper salts gets its blue from the same copper ions as the natural material, but the copper is concentrated at the surface and decreases inward.G&G Spring 2020
Q5How is agate dyed?
Chalcedony or agate rough is shaped into blanks, sometimes first quench-crackled by thermal shock to open fractures at the surface.G&G Summer 2020The blanks are then soaked in a dye solution, such as a copper-salt bath, so the dye penetrates the surface and fractures.G&G Spring 2020
Q6Does dyed agate need special care?
CIBJO defines stability as the ability to keep its appearance under normal wear and care, and dyed chalcedony of this kind should receive the care appropriate to treated gemstones.G&G Summer 2020 · CIBJO Gemstone Book 2022
What this page can answer
This page covers
- How Dyed Agate forms and what gives its colourFormation setting, process and timescale, each finding graded and sourced
- How to identify Dyed AgateIdentification points from the research literature
- Treatments and enhancements of Dyed Agate1 registered treatments: status, stability, how common they are and identification leads
- Dyed Agate in English, Chinese and Japanese; national standard namesNames in four languages, the GB/T standard name and the suggested listing name; and: Has any of GIA, FTC, CIBJO or Gem-A put a name for it on record here?
- Listing and disclosing Dyed AgateThe listing name to use; what must be disclosed before sale
What we cannot conclude
- Whether one particular bead is natural, treated or synthetic — only a laboratory report can settle that.
- Geographic origin, unless an origin report accompanies the item.
- Price, rarity or investment value: this wiki covers naming and disclosure only.
Material research: formation, causes and history
What authoritative sources say about how this material forms, what causes its colour and optical effects, where its name comes from and how people have used it. Each statement carries an evidence grade and its sources; it describes the material in general, not any specific piece.
How it forms
Dyed agate (dyed chalcedony) is a treated product obtained by applying a dye to natural chalcedony/agate to alter its colour; it is not formed in nature. Cut chalcedony/agate is immersed in a dye solution so the dye penetrates along the surface and any surface-reaching fractures. GIA research shows that chalcedony dyed with copper salts owes its blue colour to Cu2+ ions, with copper concentrated at the surface and decreasing toward the interior — the so-called mantle zoning. This record covers only the treatment process, its effects and its stability boundaries, not natural ore formation.
Scope: Covers chalcedony/agate treated by dyeing (especially with copper salts) to alter its colour; does not apply to natural untreated chalcedony/agate, nor does it serve as an identification conclusion for any specific sample.
Sources CIBJO Gemstone Book 2022 · G&G Spring 2020
Where it forms
No natural formation environment applies: this is a post-treatment product, produced by soaking the material in a dye solution at ambient or heated conditions (the cited sources give no specific temperatures or times).
Sources CIBJO Gemstone Book 2022
Its parent chalcedony/agate has its own natural setting, but that describes the rough material, not the dyed treated product; this record makes no treated-product claim about the parent's origin.
Sources CIBJO Gemstone Book 2022 · G&G Spring 2020
How it forms, step by step
Select chalcedony/agate rough and shape it into blanks (optionally first quench-crackled by thermal shock to open surface-reaching fractures).
Immerse the blanks in a dye solution (e.g. a copper-salt bath) so the dye penetrates the surface and fractures.
Dye becomes enriched at the surface and decreases inward, producing a colour band from surface to centre (mantle zoning).
Remove, dry and polish to yield the colour-altered finished product.
Sources CIBJO Gemstone Book 2022
Link to appearance
The colour of dyed chalcedony comes from the applied dye (for copper-salt dyeing, from Cu2+), concentrated at the surface and along surface-reaching fractures, and can reproduce the green-to-blue look of chrysocolla-in-chalcedony.
Sources G&G Spring 2020
Timescale
The sources state no process duration for the dyeing treatment and no historical date for its use.
Sources CIBJO Gemstone Book 2022
Related base materials
- Chalcedony / agate (microcrystalline quartz): The natural parent material that has been dyed; dyeing changes only the colour, not the type of material
How it is identified
For dyed agate, colour and banding by themselves do not reveal whether the hue is natural or produced by dyeing or heating, so visual appearance cannot settle naturalness or treatment; a trustworthy identification and any treatment ruling call for instrumental examination at a qualified gem laboratory, and this entry is no basis for self-testing.
Evidence grade AScope: Appearance cannot replace identification; naturalness, dyeing or heat treatment must be determined at a qualified gem laboratory, and this entry is not a self-testing basis.
Sources G&G Summer 2014 · CIBJO Gemstone Book 2022
Other research findings
Dyeing means introducing a dye or stain into natural materials or artificial products so as to change their colour; dyed agate is consequently a treated product rather than natural, untreated material.
Evidence grade AScope: Applies to CIBJO's definition of dyeing; it does not cover specific dye formulations or quality.
Sources CIBJO Gemstone Book 2022
Chalcedony dyed with copper salts owes its blue colour to Cu2+ ions, the same mechanism as natural blue chalcedony containing chrysocolla inclusions; in the dyed material copper is concentrated at the surface and decreases inward (mantle zoning), and its Si/Cu ratio is much higher than that of natural blue chalcedony, serving as a discriminative clue.
Evidence grade AScope: Applies to the copper-salt dyed chalcedony measured here; the authors note that applying these methods to other dyed chalcedonies needs further verification.
Dyed chalcedony is commonly used to imitate chrysocolla-in-chalcedony ('gem silica'/blue chalcedony); in recent years many dyed chalcedony imitations have appeared on the Taiwan market, were submitted as 'natural blue chalcedony', and require tests such as Raman spectroscopy to separate them from natural material.
Evidence grade AScope: Concerns the market role and identity boundary of dyed chalcedony as an imitation; it does not judge any specific dealer or specimen.
In quench-crackled dyed chalcedony the whitish/dyed zones are concentrated at the surface along surface-reaching fractures, a known structural feature of this treatment; CIBJO defines stability as the ability to maintain appearance under normal wear and care, so such dyed material should receive the care appropriate to treated gemstones.
Evidence grade BScope: Applies to the structural observation for quench-crackled dyed chalcedony and CIBJO's stability definition; it states no specific service life.
Sources G&G Summer 2020 · CIBJO Gemstone Book 2022
Limits of this research
- Research status: Formation, occurrence or other material-specific findings found in authoritative sources
- The sources give no process duration, dye concentration or temperature for the dyeing treatment.
- Copper-salt dyeing and natural chrysocolla-bearing material share the same colour mechanism, so separation relies on instrumental testing and is unreliable by eye.
- The stability and care requirements for quench-crackled dyeing are not quantified in the sources; this record gives only a qualitative boundary.
Methodology
- Origin determination and its limits
- Quality grading and value factors
- How gemmology became a technical discipline
Evidence grades
- A
- Standards bodies, government geological surveys, peer-reviewed research and museum records
- B
- Institutional educational material
- C
- Specialist databases or cautious readings
A statement is never graded above its strongest source.
This section is LumaLark's own factual restatement of public authoritative sources, credited item by item; it contains no verbatim excerpts, images or third-party logos.
DecideListing name, disclosure, care and treatments
- Suggested listing name
- Dyed Agate
GB/T 16552—2017 Table 1
Construction or treatment status
Treated: dyed
Treatments recorded for this material: Heated / Heat-treated (via parent material), Filled / Fracture-filled (via parent material), Dyed (via parent material)
Related:Disclosure and cautions
This page cannot answer
Natural? · Origin · Price
A lab report settles these; this wiki covers naming and disclosure.
Related:What this page can answer
Answer at a glance
Dyed Agate is Dyed chalcedony/agate; use "Dyed Agate" for listings, and disclose any known treatments.
What this means for you
Before buying, check the recommended listing name "Dyed Agate" and any disclosed treatments on this page, and ask the seller for a grading report if in doubt.
Known uncertainty
- Last reviewed
- 2026-09-01
Care and wear
No care facts are recorded for this entry itself. Its parent material has care records: see Quartz.
Treatments and identification leads
Values not givenThe registered treatment for Dyed Agate is dyeing, with the status colour-treated; stability and prevalence are recorded as “—”, meaning the cited source gives no value, not “none”. Identification cluesThe identification lead is uneven colour distribution under magnification, with colourant often concentrated in fractures, gaps between grains or surface pits; the source is the dyeing treatment item in GB/T 16553—2017 Gems — Testing.
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| Treatment | Market frequency (CIBJO) | Stability (CIBJO) | GB/T 16552 category | JJA/AGL listing | Identification leads |
|---|---|---|---|---|---|
| dyeingStatus: colour treated | — | — | Optimization | — | See identification leads |
| Heating | — | — | Optimization | — | — |
| Filling | — | — | Graded — see §5.4.1, Table 1 | — | — |
Where each treatment acts (schematics): Dyed
“—” means the cited source gives no value for that item, not “none”. Source: GB/T 16553—2017; GB/T 16552—2017 Table B.1 (row for Chalcedony)
Whether a treatment has to show in the name differs between the two rule sets (this site’s paraphrase):
- GB/T 16552—2017: a method classed as treatment has to be stated in the name itself — the method put before the name, or added in brackets after it; a method classed as optimization does not need to appear in the name, though one marked “Optimization (annotation required)” still has to be noted in the quality documents. Source: §5.4.2.1 a), b); §5.4.2.2 a)
- CIBJO Gemstone Book 2022: no longer splits treatments into ones that need specific disclosure and ones that need only general disclosure: every treatment is to be disclosed, and the seller tells the buyer which treatment was used and what special care it calls for. Source: §4.2.5 Note 2, §4.2.5.1, pp.14–15
VerifyNames, standards, technical facts, clauses and sources
Names
Besides Dyed Agate, the name register records "Dyed agate", for which no restriction on use as a name is recorded.
Standard and listing namesThe name Dyed Agate does not appear anywhere in GB/T 16552—2017 and is not among the basic names in Annex A; the standard does not list this name, and its naming counterpart is agate (GB/T 16552—2017). The suggested listing name is Dyed Agate. Trade and mineralogical namesThe English trade name, synonym and market name is Dyed agate, and the mineralogical name is Dyed chalcedony/agate. Names in four languagesThe four-language names are the Simplified Chinese name, the Traditional Chinese name, the English name Dyed Agate and the Japanese name. Institution usageOn authority wording, the entry's own English name is Dyed Agate; the FTC and CIBJO texts on file have no wording for this name (checked), and GIA and Gem-A are unchecked. Bodies without a recorded wording show the entry's own English name, which does not represent their position. Japanese namesThe entry's own Japanese name is shown, and its wording by GSJ (Japan) is not yet verified by this site.
Name register
Every name recorded for this entry, with how it is classified, whether it may be matched to this entry automatically, whether it may be used as a product name, and the clause it rests on.
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| Name | Type | Matching | Use as a name | Basis |
|---|---|---|---|---|
| no restriction recorded (1) | ||||
| Dyed agateEnglish | market name | matched automatically | no restriction recorded | editorial ruling (no clause cited) |
How each authority words this name: see Names › Authority wording.
- GSJ (Japan) formal name
- 染色アゲート (not yet checked for this body — the entry's own Japanese name is shown)
- GB/T naming counterpart (this name is not in the standard)
- 玛瑙 (GB/T 16552—2017 §5.4.2.1 a))
- Mineralogical name
- Dyed chalcedony/agate
Four-language names
- 简体中文
- 染色玛瑙
- 繁體中文
- 染色瑪瑙
- English
- Dyed Agate
- 日本語
- 染色アゲート
See also: Misleading and prohibited trade names · Supplementary name index
Classification
- Origin
- Natural materials
- Material domain
- Natural inorganic gem materials
- Browsing family
- Quartz and chalcedony materials
- Identity tier
- Trade name: colour / appearance variety
- Mineral chemical class
- Silicates
- Construction or treatment status
- Treated: dyed
Treatments listed by standards
For Dyed Agate, this site applies the “Chalcedony (agate/jasper)” row of GB/T 16552—2017 Annex B, Table B.1: heating is classed as optimization, dyeing is classed as optimization, and filling is classed according to its grades.
GB/T 16552-2017, Annex B, Table B.1
Under the “Chalcedony (Agate/Jasper)” row of Table B.1: Heating Optimization; Filling Graded — see §5.4.1, Table 1; Dyeing Optimization. The full row, with the effect column, is on the Chalcedony page.
What Table B.1 is, and how the “see 5.4.1” grades are defined: see the GB/T 16552: optimization vs treatment page.
What it is and how it's identified
The identification facts for Dyed Agate are recorded for chalcedony (including agate and jasper) as a whole class; they are class values, not data measured for Dyed Agate on its own. The CIBJO laboratory protocol places Dyed Agate under Chalcedony; its identification section is on the Chalcedony entry, and the list of required methods is on the laboratory testing page. Dyed Agate can be recognised under magnification: the colour is unevenly distributed, with dye mostly concentrated in fractures, grain boundaries or surface pits. This lead applies to colour-treated Dyed Agate, and the clause is written for chalcedony as a whole class; the GB/T 16553—2017 standard it rests on can only be used as a reference for Dyed Agate and does not govern it directly.
Registered material facts
Each row carries its own source and check date and can be cited on its own; “—” means the cited source gives no value, not “none”.
Items below that name the class they cover give the cited clause’s value for that whole class, not a measurement of Dyed Agate (how to read class-level values).
How far testing can go
The CIBJO laboratory protocol covers Dyed Agate under “Chalcedony” (§6.1.16): see identification on the Chalcedony entry; the required tests are listed on the CIBJO laboratory protocol table for Chalcedony.
Dyed Agate that has undergone dyeing can be identified by the following features: Under magnification the colour is unevenly distributed and mostly concentrated in fissures, between grains or in surface hollows.
GB/T 16553—2017
- Treatment state
- colour treated
- Does this standard apply
- can be followed as a reference only
- What this covers
- chalcedony, including agate and jasper (the whole class)
- Treatment
- dyeing
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.2.5 (dyeing) (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Each row's “Source & check” expands to the full source; the date beside it is the fact check date.
Evidence and sources
Authority basis and clause sources
Sources
- CIBJO – The World Jewellery Confederation. Gemmological Laboratories Book (Blue Book), Gemmological Commission 2024-1.
- CIBJO – The World Jewellery Confederation. The Gemstone Book (Blue Book), 2022.
- SAMR / SAC (China). GB/T 16552—2017 Gems — Nomenclature.
- GIA – Gemological Institute of America (United States). Gem Encyclopedia.
- Gem-A – The Gemmological Association of Great Britain (United Kingdom).
- Federal Trade Commission (United States). In the Loupe: Advertising Diamond, Gemstones and Pearls.
Further reading
Related entries and topic cluster
Parent entry and related pages on this site. Rows marked “Planned” are suggested new content and have no link yet.
Related-entry tree for Quartz on this site: 74 entries listed by this site's parent-entry links; synthetic, treated and similar entries carry their recorded state after the name; this page (Dyed Agate) is marked.
- Quartz
Sub-entries (57)
- Agate
Sub-entries (1)
- Amethyst
- Ametrine
- Aventurine Quartz
- Aventurine Quartz / Green Aventurine
- Banded Agate
- Black Agate
- Bloodstone / Heliotrope
- Blue Lace Agate
- Carnelian
- Chalcedony
Sub-entries (2)
- Chrysoprase
- Citrine
- Clear Quartz / Rock Crystal
- Coated Quartz
- Colourless to White Quartz (brand name: Azeztulite)
- Crazy Lace Agate
- Dendritic Agate
- Dyed Agate (Treated: dyed)
- Elestial Quartz / Skeletal Quartz
- Eye Agate
- Flower Agate / Cherry Blossom Agate
- Green Quartz
- High-clarity quartz with golden needle-like inclusions
- Included Quartz
- Jasper
Sub-entries (1)
- Madeira Citrine
- Malachite Agate
- Morion / very dark Smoky Quartz
- Moss Agate
- Moss Chalcedony
- Multi-inclusion Quartz
- Onyx (banded chalcedony)
- Phantom Quartz
- Prase
- Prasiolite / Green Quartz
- Quartz Cat’s-eye
- Quartz claimed to be from the Himalayas
- Quartz Crystal
- Quartz with dark needle-like inclusions
- Quartz with fine fibrous inclusions
- Quartz with flower-like inclusions
- Quartz with golden needle-like inclusions
- Quartz with green needle-like inclusions
- Quartzite Jade
- Quartzose Jade
- Red Agate
- Rock Crystal
- Rose Quartz
- Rutilated Quartz
- Sard
- Sardonyx
- Silicified Asbestos
Sub-entries (2)
- Hawk’s Eye
- Tiger’s Eye
Sub-entries (1)
- Smoky Quartz
- Smoky Quartz (brown variety)
- Strawberry Quartz
- Yellow-green Quartz
- Agate
This table scrolls sideways on narrow screens.
| Page | Content | Status |
|---|---|---|
| Browsing family | Quartz and chalcedony materials | Live |
| Treatments recorded for this material | Heated / Heat-treated (via parent material), Filled / Fracture-filled (via parent material), Dyed (via parent material) | Live |
| Related articles | To be added (placeholder) | Planned |
Who maintains this page
The material facts in the Dyed Agate entry are maintained by the LumaLark wiki and matched one by one to the standard clauses or institutional sources they cite: every fact carries its source (with a clause or page locator) and a check date, so it can be traced back to the original. The entry exists so that buyers and sellers can check naming, disclosure and material facts item by item.