On this page
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
Lagoon Tourmaline
A trade name for blue-green tourmaline, historically associated with specific material from Afghanistan; there is no international standard for this trade name. 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 Lagoon Tourmaline 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 Lagoon TourmalineHow far lab testing can go
- Treatments and enhancements of Lagoon TourmalineThe enhancements and treatments the GB/T and JJA/AGL tables list
- Caring for and wearing Lagoon TourmalineCleaning, heat, chemicals and light, as the cited sources give them
- Hardness, density and refractive index of Lagoon TourmalineEach value with its source and check date
- Lagoon Tourmaline in English, Chinese and Japanese; national standard namesNames in four languages, the GB/T standard name and the suggested listing name; and: Which of GIA, FTC, CIBJO and Gem-A have a name for it on record, and do those agree?
- Listing and disclosing Lagoon TourmalineThe listing name to use; what must be disclosed before sale
- Standard clauses that define Lagoon TourmalineWhich clause defines it, each cross-checked
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
Lagoon tourmaline is a market descriptor for blue-green tourmaline; the cited sources give no authoritative mineralogical definition, so it is treated as a trade name with its evidence downgraded to C. Blue-green in tourmaline has several possible causes: both copper (Cu2+) and iron (Fe2+) can give greenish tones, with bands near 900–925 nm and ~700 nm respectively that allow them to be distinguished; the blue-to-green of Paraíba-type copper-bearing tourmaline is copper-coloured, and such material comes mainly from Brazil, Nigeria, and Mozambique. The parent material is elbaite in granite-bearing pegmatites; lagoon tourmaline itself has no independent genesis.
Scope: Applies only as background on a trade name for blue-green tourmaline; as there is no authoritative definition, it cannot serve as a basis for identification or origin, and the blue-green colour mechanism cannot be generalised.
Sources GIA Tourmaline Description · G&G Summer 2009 · G&G Spring 2006 +1
- Tourmaline Description (GIA Gem Encyclopedia)
- Spectral Differentiation Between Copper and Iron Colorants in Gem Tourmalines (Gems & Gemology, Summer 2009)
- “Paraíba”-Type Copper-Bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting By LA-ICP-MS (G&G Spring 2006)
- Colored Stones Unearthed: Gem Granitic Pegmatites (Gems & Gemology, Summer 2025, Vol. 61, No. 2)
Where it forms
Granite-bearing pegmatites; Paraíba-type copper-bearing tourmaline comes from Brazil, Nigeria, Mozambique, and elsewhere.
Sources GIA Tourmaline Description · G&G Summer 2009 · G&G Spring 2006 +1
- Tourmaline Description (GIA Gem Encyclopedia)
- Spectral Differentiation Between Copper and Iron Colorants in Gem Tourmalines (Gems & Gemology, Summer 2009)
- “Paraíba”-Type Copper-Bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting By LA-ICP-MS (G&G Spring 2006)
- Colored Stones Unearthed: Gem Granitic Pegmatites (Gems & Gemology, Summer 2025, Vol. 61, No. 2)
How it forms, step by step
The pegmatite's residual fluid crystallises and elbaite grows.
Sources GIA Tourmaline Description · G&G Summer 2009 · G&G Spring 2006 +1
- Tourmaline Description (GIA Gem Encyclopedia)
- Spectral Differentiation Between Copper and Iron Colorants in Gem Tourmalines (Gems & Gemology, Summer 2009)
- “Paraíba”-Type Copper-Bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting By LA-ICP-MS (G&G Spring 2006)
- Colored Stones Unearthed: Gem Granitic Pegmatites (Gems & Gemology, Summer 2025, Vol. 61, No. 2)
Trace elements such as copper (or iron) enter the lattice, producing blue-to-green colour.
Sources GIA Tourmaline Description · G&G Summer 2009 · G&G Spring 2006 +1
- Tourmaline Description (GIA Gem Encyclopedia)
- Spectral Differentiation Between Copper and Iron Colorants in Gem Tourmalines (Gems & Gemology, Summer 2009)
- “Paraíba”-Type Copper-Bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting By LA-ICP-MS (G&G Spring 2006)
- Colored Stones Unearthed: Gem Granitic Pegmatites (Gems & Gemology, Summer 2025, Vol. 61, No. 2)
“Lagoon” is a market label for the blue-green colour; it does not change the mineral identity nor correspond to an independent genesis.
Sources GIA Tourmaline Description · G&G Summer 2009 · G&G Spring 2006 +1
- Tourmaline Description (GIA Gem Encyclopedia)
- Spectral Differentiation Between Copper and Iron Colorants in Gem Tourmalines (Gems & Gemology, Summer 2009)
- “Paraíba”-Type Copper-Bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting By LA-ICP-MS (G&G Spring 2006)
- Colored Stones Unearthed: Gem Granitic Pegmatites (Gems & Gemology, Summer 2025, Vol. 61, No. 2)
Link to appearance
A blue-green appearance may be caused by copper or by iron and looks similar; the Cu2+ band near 900–925 nm is distinguishable from the ~700 nm Fe2+ band, so spectroscopy is needed to resolve the colouring element.
Sources G&G Summer 2009 · G&G Spring 2006
Timescale
The cited sources give no absolute timescale for lagoon tourmaline formation.
Sources GIA Tourmaline Description · G&G Summer 2009 · G&G Spring 2006 +1
- Tourmaline Description (GIA Gem Encyclopedia)
- Spectral Differentiation Between Copper and Iron Colorants in Gem Tourmalines (Gems & Gemology, Summer 2009)
- “Paraíba”-Type Copper-Bearing Tourmaline from Brazil, Nigeria, and Mozambique: Chemical Fingerprinting By LA-ICP-MS (G&G Spring 2006)
- Colored Stones Unearthed: Gem Granitic Pegmatites (Gems & Gemology, Summer 2025, Vol. 61, No. 2)
Related base materials
- Tourmaline group (elbaite): trade name for blue-green tourmaline
Causes of colour and optical effects
Both copper (Cu2+) and iron (Fe2+) can produce blue-to-green tones; Cu2+ has a strong band near 900–925 nm where Fe2+ absorption is typically minimal, allowing copper and iron colourants to be distinguished.
Evidence grade AScope: A copper/iron discrimination mechanism, not specific to the “lagoon” trade name; it does not determine origin.
The bright blue-to-green of Paraíba-type copper-bearing tourmaline is copper-coloured, and such copper-bearing tourmaline occurs in Brazil (Paraíba and Rio Grande do Norte States), Nigeria, and Mozambique.
Evidence grade AScope: Concerns copper-bearing (Paraíba-type) tourmaline; it must not be extended to copper-free blue-green tourmaline and is not equivalent to the “lagoon” trade name.
Other research findings
Lagoon tourmaline is a market name for blue-green tourmaline, and the cited sources give no authoritative mineralogical definition; the known blue-green range is close to that of indicolite (dark violetish blue, blue, or greenish blue tourmaline).
Evidence grade CScope: “Lagoon” has no authoritative definition; it is only a commercial colour name, not a basis for identification, origin, or quality.
Sources GIA Tourmaline Description
Synthesis: blue-green tourmaline is elbaite in granite-bearing pegmatites, its blue-green colour caused by copper or iron; “lagoon” is only a market colour name with no independent genesis, and the colouring element requires spectroscopy.
Evidence grade BScope: “Lagoon” is undefined; this synthesis is background only and cannot replace laboratory testing.
Sources GIA Tourmaline Description · G&G Summer 2025
Limits of this research
- Research status: Only partial material-specific findings found; gaps are stated as gaps
- No authoritative definition of “lagoon tourmaline” has been found, so its evidence is downgraded to C; it is only a commercial/colour name.
- The cited sources give no absolute timescale for lagoon tourmaline formation.
- No quantitative data on the distribution of blue-green colouring elements (copper vs. iron) are given, and copper-colouring data from one locality must not be generalised to all tourmaline.
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
- Lagoon Tourmaline (blue-green tourmaline)
16 CFR Part 23 §23.24
Construction or treatment status
Natural identity; treatment status unknown
Treatments recorded for this material: Heated / Heat-treated (via parent material), Filled / Fracture-filled (via parent material), Dyed (via parent material), Irradiated (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
"Lagoon Tourmaline" 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 "Lagoon Tourmaline (blue-green tourmaline)" 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
- Lagoon Tourmaline (blue-green tourmaline)
Care and wear
The item-by-item care advice that the GIA Care and Cleaning Guide gives for the whole class, and so for Lagoon Tourmaline, is set out in full under care on the Tourmaline entry.
Care
Each row's “Source & check” expands to the full source; the date beside it is the fact check date.
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 | — | — |
| Filling | — | — | Graded — see §5.4.1, Table 1 | — | — |
| Dyeing | — | — | Treatment | — | — |
| Irradiation | — | — | Treatment | — | — |
| Coating | — | — | Treatment | — | — |
“—” means the cited source gives no value for that item, not “none”. Source: GB/T 16552—2017 Table B.1 (row for Tourmaline)
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
Trade and mineralogical namesLagoon Tourmaline is a commercial and trade name; its mineralogical description is a trade name for blue-green tourmaline, historically associated with particular Afghan material. Names in four languagesThe four-language names cover Simplified Chinese, Traditional Chinese, English (Lagoon Tourmaline) and Japanese. Standard and listing namesThe suggested listing name is blue-green tourmaline (Lagoon Tourmaline). The corresponding national-standard name is tourmaline (GB/T 16552—2017 Table A.1); the name itself is not listed in the original. Institution usageOn authority wording, the CIBJO Gemmological Laboratories Book 2024 has Lagoon Tourmaline on record; the FTC text on file has no wording for this name (checked); GIA and Gem-A are unchecked; bodies without a record show the entry's own English name, which does not represent their position. Japanese namesFor GSJ (Japan), the wording for the entry's own Japanese name is not yet verified by this site.
- GSJ (Japan) formal name
- ラグーン・トルマリン (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)
- 碧玺 (GB/T 16552—2017 Table A.1)
- Mineralogical name
- Blue-green tourmaline trade name; historically associated with specific Afghan material
Four-language names
- 简体中文
- 泻湖碧玺
- 繁體中文
- 瀉湖碧璽
- English
- Lagoon Tourmaline
- 日本語
- ラグーン・トルマリン
See also: Misleading and prohibited trade names · Supplementary name index
Classification
- Origin
- Natural materials
- Material domain
- Natural inorganic gem materials
- Browsing family
- Tourmaline-supergroup minerals and gem varieties
- Identity tier
- Trade name: colour / appearance variety
- Mineral chemical class
- Silicates
- Construction or treatment status
- Natural identity; treatment status unknown
Treatments listed by standards
The treatment classification for Lagoon Tourmaline applies the Tourmaline row of GB/T 16552—2017 Annex B, Table B.1: heat treatment is listed as an enhancement; the category for filling is defined by the grades of the cited standard; dyeing, irradiation and coating are all listed as treatments. The full row, with the effect column, is on the Tourmaline page, and the notes to Table B.1 and the definitions of the filling grades are on the Gem treatments page.
GB/T 16552-2017, Annex B, Table B.1
Under the “Tourmaline” row of Table B.1: Heating Optimization; Filling Graded — see §5.4.1, Table 1; Dyeing Treatment; Irradiation Treatment; Coating Treatment. The full row, with the effect column, is on the Tourmaline 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 composition (phase) of Lagoon Tourmaline is recorded as the tourmaline group; the material facts recorded for tourmaline (the whole mineral group) are not measurements of Lagoon Tourmaline alone, and include: crystalline, trigonal, with rounded trigonal prismatic or ditrigonal pyramidal-prismatic crystals with marked longitudinal striations; Mohs hardness 7–8, no cleavage; density 2.46–3.26 g/cm³, which this site notes is derived from the cited clause's 3.06 with a tolerance of +0.20/−0.60; optically anisotropic, uniaxial, negative; refractive index 1.615–1.655, which this site notes is derived from the cited clause's 1.624–1.644 with a tolerance of +0.011/−0.009; birefringence 0.018–0.04, which this site notes is the overall value where the clause has finer subdivisions; pleochroism moderate to strong, in lighter and darker shades of the body colour, for the untreated state; chatoyancy may be seen, and colour change may be seen but is rare.
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”.
Luminescence, UV-visible spectrum, infrared spectrum, magnification: these whole-class features are given in the cited clause for tourmaline (the whole mineral group), so they are not repeated on the Lagoon Tourmaline page; see the material facts on the Tourmaline entry.
Items below that name the class they cover give the cited clause’s value for that whole class, not a measurement of Lagoon Tourmaline (how to read class-level values).
Definition
Lagoon Tourmaline — composition (phase): tourmaline group
CIBJO Gemmological Laboratories Book 2024
Source & check 2026-09-22
- Source
- Fact checked on
- 2026-09-22
Structure
Lagoon Tourmaline — structure (overall): crystalline
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Lagoon Tourmaline — structure (crystal system): trigonal
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Lagoon Tourmaline — structure (crystal habit): rounded trigonal prisms or more complex ditrigonal prism-and-pyramid combinations; the crystal faces are distinctly striated lengthwise.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Durability
Lagoon Tourmaline — Mohs hardness: 7–8
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
- tourmaline (the whole mineral group)
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Lagoon Tourmaline — cleavage: none
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Physical properties
Lagoon Tourmaline — density: 2.46–3.26 g/cm³
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
- Qualification
The clause we cite gives 3.06, with a stated tolerance of +0.20 / -0.60. The range shown here is worked out from that.
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Optical
Lagoon Tourmaline — optic character: uniaxial, optically negative (anisotropic)
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Lagoon Tourmaline — refractive index: 1.615–1.655
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
- Qualification
The clause we cite gives 1.624–1.644, with a stated tolerance of +0.011 / -0.009. The range shown here is worked out from that.
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Lagoon Tourmaline — birefringence: 0.018–0.04
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
- General note
- the clause has finer ranges
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Lagoon Tourmaline — pleochroism: moderate to strong, in lighter and deeper shades of the body colour.
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Lagoon Tourmaline — optical effect (chatoyancy): seen
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Lagoon Tourmaline — optical effect (colour change): seen; rare
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Lagoon Tourmaline — body colour: lighter tones of higher saturated blue, greenish blue, blue-green to bluish green.
CIBJO Gemmological Laboratories Book 2024
- Treatment state
- untreated
- Qualification
In chapter 7 of the CIBJO Gemmological Laboratories Book, the colour descriptions of Aquamarine, Chrysocolla, Dioptase and other entries also name blue or a bluish colour.
- General note
- colour alone is not identity
Source & check 2026-09-26
- Source
- Fact checked on
- 2026-09-26
- CIBJO definitions
- chatoyancy, colour change
Quality factors
Lagoon Tourmaline — quality factor (lustre): vitreous
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- tourmaline (the whole mineral group)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.10 (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): 1.635 / 2.86; Closest values: 1Prehnite 1.625 / 2.88, 2Larimar 1.62 / 2.82, 3Datolite 1.646 / 2.95, 4Danburite 1.633 / 3, 5Sugilite 1.61 / 2.77
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 Lagoon Tourmaline under “Tourmaline” (§6.1.86): see identification on the Tourmaline entry; the required tests are listed on the CIBJO laboratory protocol table for Tourmaline.
How far testing can go
Each row's “Source & check” expands to the full source; the date beside it is the fact check date.
Clause-level definitions
Lagoon Tourmaline is defined directly in Chapter 7, the list and definitions of gem materials, of the CIBJO Gemmological Laboratories Book 2024, under the term Lagoon tourmaline, as tourmaline of lighter tone and higher saturation in blue, greenish blue, and bluish green through to a blue-tinged green. Cross-check result: defined directly by CIBJO; no English term of the same name found directly in the GB/T annex of this edition.
This table scrolls sideways on narrow screens.
| Term | Clause | Definition | Cross-check |
|---|---|---|---|
| Lagoon tourmaline | 7.2.1.127 | tourmaline with lighter tones of higher saturated blue, greenish blue, blue-green to bluish green | Defined directly by CIBJO; no identically named English entry was found in this edition of the GB/T annex. |
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 § 23.24 — Disclosure of treatments to gemstones. 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 Tourmaline on this site: 12 entries listed by this site's parent-entry links; synthetic, treated and similar entries carry their recorded state after the name; this page (Lagoon Tourmaline) is marked.
This table scrolls sideways on narrow screens.
| Page | Content | Status |
|---|---|---|
| Browsing family | Tourmaline-supergroup minerals and gem varieties | Live |
| Treatments recorded for this material | Heated / Heat-treated (via parent material), Filled / Fracture-filled (via parent material), Dyed (via parent material), Irradiated (via parent material), Coated (via parent material) | Live |
| Related articles | To be added (placeholder) | Planned |
Who maintains this page
The material facts in the Lagoon Tourmaline 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; clause-level definitions also carry a cross-check result. The entry exists so that buyers and sellers can check naming, disclosure and material facts item by item.