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UnderstandWhat it is, what people ask, how far this page goes
Natural inorganic gem materials · Trade name: colour / appearance variety · Natural identity; treatment status unknown
Prasiolite / Green Quartz
Also known asGreen Amethyst (not to be used as a name) · Greened Amethyst (annotation only, never as the product name)
A trade name for green Quartz, given in CIBJO Annex 8 as "Prasiolite, or Green Quartz"; most is coloured by heating or irradiating Amethyst, and FTC 16 CFR §23.26(a) prohibits calling it "green amethyst". 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.
What this page can answer
This page covers
- How Prasiolite / Green Quartz forms and what gives its colourFormation setting, process and timescale; where its colour and optical effects come from, each finding graded and sourced
- How to identify Prasiolite / Green QuartzHow far lab testing can go
- Treatments and enhancements of Prasiolite / Green QuartzThe enhancements and treatments the GB/T and JJA/AGL tables list
- Hardness, density and refractive index of Prasiolite / Green QuartzEach value with its source and check date
- Prasiolite / Green Quartz 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?
- Name origin and history of Prasiolite / Green QuartzWhere the name comes from
- Listing and disclosing Prasiolite / Green QuartzThe 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
"Green quartz" (green amethyst in the trade) is the green variety of quartz whose CIBJO Annex 8 commercial name is "Prasiolite, or Green Quartz". It has two origins: natural — amethyst may convert to the more common citrine and the rarer green quartz naturally under certain geologic conditions; and artificial — for the most part, gem-quality green quartz is produced by exposing amethyst to high temperatures for a specific period of time. The colour relates to the purple colour centre in quartz: the iron impurity forms the amethyst colour centre under low-grade radiation, and heat destabilises that colour centre, producing green quartz where ferrous iron is present (and citrine where ferric iron is present). Rare natural green quartz occurrences exist too, e.g. on the Nevada–California border where amethyst, citrine and green quartz occur together, attributed to heat from a secondary rhyolite extrusion.
Scope: Applies to an overview of the origin (natural and heated) and colour mechanism of green quartz (Prasiolite/Green Quartz) as the green variety of quartz; the colour mechanism is based on the GIA 1982 study of green quartz. Synthetic quartz and other treated material are outside the scope of this record.
Sources G&G Spring 1982
Where it forms
Quartz crystallizing from silica-bearing solutions in vugs and cavities.
Sources G&G Spring 1982
The Nevada–California border detrital occurrence where amethyst, citrine and green quartz occur together (a natural locality).
Sources G&G Spring 1982
How it forms, step by step
Quartz crystallizes from migrating silica-bearing solutions; the iron impurity forms the amethyst purple colour centre under low-grade radiation.
Sources G&G Spring 1982
Heating destabilises the purple colour centre: green quartz forms where ferrous iron is present.
Sources G&G Spring 1982
Artificial route: exposing amethyst to high temperatures for a specific period of time yields gem-quality green quartz.
Sources G&G Spring 1982
Link to appearance
The colour of green quartz is governed by the state of the iron-bearing colour centre; citrine and amethyst also occur at the same locality, and natural green quartz is rare because the required conditions are exacting.
Sources G&G Spring 1982
Timescale
The source states that the heat treatment needed is on the order of heating at 140–380°C for one hour (after Nassau, 1980, as cited); the natural conversion occurs under low-grade radiation and heating over a geologic time span.
Sources G&G Spring 1982
Related base materials
- Quartz (SiO2): Prasiolite (green quartz) is the green variety of quartz, not an independent mineral species
Supporting findings
Under natural conditions amethyst may convert to the more common citrine and the rarer green quartz by certain geologic processes.
Evidence grade AScope: A natural-conversion statement; it does not imply all green quartz is natural.
Sources G&G Spring 1982
Natural green quartz requires nature to have supplied the necessary impurities, radiation and high temperatures, making it rare; the green quartz on the Nevada–California border is attributed to heat from a secondary rhyolite extrusion.
Evidence grade AScope: For the cited natural occurrence; the heat-source explanation is the source's hypothesis.
Sources G&G Spring 1982
Recorded localities
Authoritative sources list the localities below; the list is not exhaustive.
Africa
- Gamsberg area, Khomas, Namibia
Sources Mindat: Prasiolite
- Boekenhouthoek, Mpumalanga, South AfricaMarked with a question mark (doubtful) on Mindat.
Sources Mindat: Prasiolite
Europe
- Płóczki Górne, Lower Silesian Voivodeship, Poland
Sources Mindat: Prasiolite
North America
- California–Nevada border north of Reno, United StatesNatural green quartz occurrence, not a commercial source.
Sources G&G Spring 1982
- Thunder Bay, Ontario, Canada
Sources Mindat: Prasiolite
South America
- Montezuma area, Minas Gerais, BrazilAmethyst here turns green on heating; a source of raw material for treatment.
Sources G&G Spring 1982
- Los Catalanes, Artigas, Uruguay
Sources Mindat: Prasiolite
These are localities recorded by authoritative sources, not an origin finding for any individual piece. The CIBJO Gemstone Book (2022, §4.2.3) says a place of origin names where a gem was mined or harvested, is a matter of opinion, does not imply a level of quality, and that cutting, processing or exporting centres must not be used to imply origin. See how far testing can go on this page, the origin determination guide and the overview of recorded localities.
Causes of colour and optical effects
The purple colour in quartz is caused by an iron-impurity colour centre formed under low-grade radiation; heat destabilises the centre, producing green quartz where ferrous iron is present and citrine where ferric iron is present.
Evidence grade AScope: A general mechanism of colour in quartz (after GIA's 1982 green-quartz study).
Sources G&G Spring 1982
Where the name comes from
The US Federal Trade Commission's Jewelry Guides (16 CFR §23.26) state that it is unfair or deceptive to mark or describe an industry product with the incorrect varietal name, and give the use of the term 'green amethyst' to describe prasiolite as an example of a description that may be misleading.
Evidence grade AScope: Summarises the text of the US Guides only; it applies to marketing in the United States and is not legal advice for any jurisdiction or item.
Sources 16 CFR Part 23 (US)
Other research findings
Green quartz is the green variety of quartz whose CIBJO Annex 8 commercial name is "Prasiolite, or Green Quartz"; it is not an independent mineral species.
Evidence grade AScope: Naming and variety classification; the name is a commercial/trade name.
Sources CIBJO Gemstone Book 2022 · G&G Spring 1982
For the most part, gem-quality green quartz is produced by exposing amethyst to high temperatures for a specific period of time (known in the industry as prasiolite or "greened amethyst").
Evidence grade AScope: Concerns the treatment route for gem-quality green quartz; natural green quartz is very rare.
Sources G&G Spring 1982
Limits of this research
- Research status: Formation, occurrence or other material-specific findings found in authoritative sources
- The colour-cause and natural-conversion findings above rest on GIA's 1982 green-quartz study, an older source.
- The database flags the alias "Green Amethyst" as a misnomer disallowed under FTC 16 CFR §23.26(b)(2), but the cited sources do not include the FTC regulatory text, so that statement is not used here as verifiable evidence.
- No absolute geological age for natural green-quartz formation is given by the sources.
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
- Green Quartz (natural colour or treatment must be determined by testing)
16 CFR Part 23 §23.26(a), §23.24
Construction or treatment status
Natural identity; treatment status unknown
Treatments recorded for this material: Heated / Heat-treated, Irradiated, Filled / Fracture-filled (via parent material), Dyed (via parent material), Coated (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
"Prasiolite / Green Quartz" is a market name rather than a mineral species name; before using it, verify: Trade name rather than a mineralogical species name.
Evidence
What this means for you
Before buying, check the recommended listing name "Green Quartz (natural colour or treatment must be determined by testing)" and any disclosed treatments on this page, and ask the seller for a grading report if in doubt.
Known uncertainty
- This entry's exact material identity is not fully settled.
- See “Disclosure and cautions” above
- Last reviewed
- 2026-09-01
Trade-name ruling
- Trade name rather than a mineralogical species name.
- Suggested listing name
- Green Quartz (natural colour or treatment must be determined by testing)
Care and wear
No care facts are recorded for this entry itself. Its parent material has care records: see Quartz.
Treatments and identification leads
One row per treatment, with three standards side by side: how often it occurs and how stable it is (CIBJO), its category in GB/T 16552—2017 Table B.1 (this site's paraphrase) and how the JJA/AGL 2025 table lists it. Each CIBJO value links to its entry under “Testing and market”, where the wording and source are given in full.
This table scrolls sideways on narrow screens.
| Treatment | Market frequency (CIBJO) | Stability (CIBJO) | GB/T 16552 category | JJA/AGL listing | Identification leads |
|---|---|---|---|---|---|
| Heating | — | — | Optimization | — | — |
| Irradiation | — | — | Optimization | — | — |
| Filling | — | — | Graded — see §5.4.1, Table 1 | — | — |
| Dyeing | — | — | Treatment | — | — |
| Coating | — | — | Treatment | — | — |
| heating | — | — | — | heating | — |
| irradiation | — | — | — | irradiation | — |
“—” means the cited source gives no value for that item, not “none”. Source: GB/T 16552—2017 Table B.1 (row for Rock Crystal); JJA/AGL 2025
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
What this table covers
What this page can give
- Registered treatments, their stability and how often they occur (see the table above)
- Identification leads for each treatment, for use when sending a stone for testing
VerifyNames, standards, technical facts, clauses and sources
Names
For Prasiolite / Green Quartz, "Greened Amethyst" may appear only as an annotation, never as the product name, while "Green Amethyst" must not be used as a name (JJA/AGL Gemstone Nomenclature 2025 p.10; 16 CFR Part 23 §23.26(a); 16 CFR Part 23 §23.25(b); GB/T 16552—2017 §5.1.1 c)); one further name in a non-Latin script is listed in the name register below (1 that may appear only as an annotation, never as the product name).
Standard and listing namesThe Chinese standard naming counterpart for Prasiolite / Green Quartz in GB/T 16552—2017 Table A.1 is green rock crystal, with the note that this name is not listed in the original; the mineralogical name refers to green quartz, and the CIBJO commercial name is written Prasiolite, or Green Quartz. The suggested listing name is green quartz (natural colour/treatment to be determined by testing). Names in four languagesFour-language names are given in Simplified Chinese, Traditional Chinese, English (Prasiolite / Green Quartz) and Japanese; the Japanese name is the entry's own, and the wording of Japan's GSJ for this material is not yet verified by this site. Institution usageThe wording of GIA, FTC, CIBJO and Gem-A for Prasiolite / Green Quartz is unchecked, and the entry's own English name does not represent the position of GIA, FTC, CIBJO or Gem-A. Trade and mineralogical namesGreen Amethyst is registered as a market name, but the FTC's 16 CFR Part 23 expressly prohibits the incorrect varietal name Green Amethyst, so it is only a search term and must not be used as a product name. Candidate search termsGreened Amethyst and its Japanese katakana form are registered in the JJA/AGL gem name handbook 2025 as transliterations, kept only as candidate search terms, which may appear only as notes and must not be the main product name.
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.
This table scrolls sideways on narrow screens.
| Name | Type | Matching | Use as a name | Basis |
|---|---|---|---|---|
| annotation only, never as the product name (2) | ||||
| Greened AmethystEnglish | transliteration | search candidate only | annotation only, never as the product name | JJA/AGL Gemstone Nomenclature 2025 p.10; 16 CFR Part 23 §23.26(a) |
| グリーンド・アメシストJapanese | transliteration | search candidate only | annotation only, never as the product name | JJA/AGL Gemstone Nomenclature 2025 p.10 |
| not to be used as a name (1) | ||||
| Green AmethystEnglish | market name | matched automatically | not to be used as a name | 16 CFR Part 23 §23.26(a); 16 CFR Part 23 §23.25(b); GB/T 16552—2017 5.1.1 c); Note: A wrong variety name that FTC §23.26(a) expressly bars; kept for search only. |
How each authority words this name: see Names › Authority wording.
- GSJ (Japan) formal name
- プラシオライト／グリーンクォーツ (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)
- 绿水晶 (GB/T 16552—2017 Table A.1)
- Mineralogical name
- Green quartz; the CIBJO Annex 8 commercial name is "Prasiolite, or Green Quartz"
- Trade names and synonyms
- Greened Amethyst (transliteration; annotation only, never as the product name)Not to be used as a name: Green Amethyst (market name)
Four-language names
- 简体中文
- 绿紫晶
- 繁體中文
- 綠紫晶
- English
- Prasiolite / Green Quartz
- 日本語
- プラシオライト／グリーンクォーツ
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
- Natural identity; treatment status unknown
Treatments listed by standards
GB/T Table B.1For Prasiolite / Green Quartz in GB/T 16552—2017 Annex B, Table B.1, this site applies the "Rock Crystal" row: heating is an optimization, irradiation is an optimization, the grades for filling are defined on the Gem treatments page, dyeing is a treatment and coating is a treatment. What Table B.1 is, is explained on the Gem treatments page. JJA/AGL designationsIn the Japanese JJA/AGL 2025 nomenclature, Green Quartz has the species quartz and colour green, with the registered treatments being heating (heat treatment) and irradiation (irradiation treatment); the listing is under Green Quartz, the original does not name Prasiolite specifically, and the heat treatment carries the alternative name greened amethyst. How to read the JJA/AGL table is explained on the Gem treatments page.
GB/T 16552-2017, Annex B, Table B.1
Under the “Rock Crystal” row of Table B.1: Heating Optimization; Irradiation Optimization; Filling Graded — see §5.4.1, Table 1; Dyeing Treatment; Coating Treatment. The full row, with the effect column, is on the Rock Crystal 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.
JJA/AGL (Japan) table of principal gem names, 2025
This table scrolls sideways on narrow screens.
| Gem name | Species | Colour | Listed in the table | Notes |
|---|---|---|---|---|
| Green Quartz | Quartz | green | heating (Heated / Heat-treated); irradiation (Irradiated) | listed under “Green Quartz” in the table; this page is related (the source does not name it); (heated tier) also called greened amethyst |
JJA/AGL definitions and nomenclature (2025 revision), table of principal gem names, p.10
How to read the JJA/AGL table: see the Gem treatments page.
What it is and how it's identified
The material facts for Prasiolite / Green Quartz are all the cited clause's values for rock crystal (the whole class), not measurements of Prasiolite / Green Quartz itself; whole-class features such as chemical composition, luminescence, UV-visible spectrum, infrared spectrum and magnification are on the Rock Crystal entry. For rock crystal (the whole class): structure crystalline, trigonal, with hexagonal prismatic crystals showing distinct horizontal striations on the prism faces; Mohs hardness 7, cleavage none; density 2.64–2.69 g/cm³, with the limits derived from the cited clause value of 2.66 and its stated tolerances of +0.03 and −0.02. For rock crystal (the whole class): optic character anisotropic, uniaxial, positive, possibly with a “bull's-eye” interference figure; refractive index 1.544–1.553, birefringence 0.009. For rock crystal (the whole class), untreated: pleochroism weak, varying with colour, and lustre vitreous; chatoyancy is visible, and asterism is visible, six-rayed and mostly seen in rose quartz.
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”.
Chemical composition, luminescence, UV-visible spectrum, infrared spectrum, magnification: these whole-class features are given in the cited clause for rock crystal (the whole class), so they are not repeated on the Prasiolite / Green Quartz page; see the material facts on the Rock Crystal entry.
Items below that name the class they cover give the cited clause’s value for that whole class, not a measurement of Prasiolite / Green Quartz (how to read class-level values).
Structure
Prasiolite / Green Quartz — structure (overall): crystalline
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Prasiolite / Green Quartz — structure (crystal system): trigonal
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Prasiolite / Green Quartz — structure (crystal habit): hexagonal prisms with prominent horizontal striations on the prism faces
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Durability
Prasiolite / Green Quartz — Mohs hardness: 7
GB/T 16553—2017
Reference points on this site: Talc 1–3, Fluorite 4, Apatite 5–5.5, Orthoclase 6–6.5, Topaz 8, Diamond 10 (Source: GB/T 16553—2017); Gypsum 1.5–2, Calcite 3, Quartz 7 (Source: Handbook of Mineralogy); Corundum 9 (Source: GIA Gem Encyclopedia (care guide))
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Prasiolite / Green Quartz — cleavage: none
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Physical properties
Prasiolite / Green Quartz — density: 2.64–2.69 g/cm³
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
- Qualification
The clause we cite gives 2.66, with a stated tolerance of +0.03 / -0.02. The range shown here is worked out from that.
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Optical
Prasiolite / Green Quartz — optic character: anisotropic material, uniaxial, with positive optic character; a “Bull's eye” interference figure may be present, and Brazil-law twinning is common in amethyst.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Prasiolite / Green Quartz — refractive index: 1.544–1.553
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Prasiolite / Green Quartz — birefringence: 0.009
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Prasiolite / Green Quartz — pleochroism: weak; it depends on the body colour.
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Prasiolite / Green Quartz — optical effect (chatoyancy): seen
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Prasiolite / Green Quartz — optical effect (asterism): seen; a six-rayed star, common in rose quartz.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
- CIBJO definitions
- chatoyancy, asterism
Quality factors
Prasiolite / Green Quartz — quality factor (lustre): vitreous
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- rock crystal (the whole class)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.16 (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.
This material (RI / SG midpoints): 1.548 / 2.67; Closest values: 1Agate 1.537 / 2.63, 2Shoushan Stone 1.56 / 2.7, 3Changhua Stone 1.56 / 2.6, 4Bamboo Coral 1.57 / 2.65, 5Synthetic Beryl 1.57 / 2.69
Show the full chart (330 registered materials)
Outside the full chart's range, drawn as triangles at the edge (RI / SG midpoints): Hematite 3.045/5.12, Synthetic Rutile 2.76/4.26, Rutile 2.753/4.23, Synthetic Moissanite 2.67/3.22
Testing and market
The CIBJO laboratory protocol covers Prasiolite / Green Quartz under “Quartz” (§6.1.65): see identification on the Quartz entry; the required tests are listed on the CIBJO laboratory protocol table for Quartz.
How far testing can go
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).
- eCFR (United States). 16 CFR § 23.26 — Misrepresentation as to varietal name. In: 16 CFR Part 23 — Guides for the Jewelry, Precious Metals, and Pewter Industries.
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 (Prasiolite / Green Quartz) 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, Irradiated, Filled / Fracture-filled (via parent material), Dyed (via parent material), Coated (via parent material) | Live |
| Related articles | To be added (placeholder) | Planned |
Who maintains this page
The material facts in the Prasiolite / Green Quartz 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.