On this page
UnderstandWhat it is, what people ask, how far this page goes
Natural inorganic gem materials · Trade name: geographic / origin-linked name · Natural identity; treatment status unknown
Zambian Emerald
A trade name for emerald associated with Zambian mines; the colour is usually bluish green, and the name is no guarantee of origin. 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 Zambian Emerald forms and what gives its colourFormation setting, process and timescale, each finding graded and sourced
- How to identify Zambian EmeraldIdentification points from the research literature; how far lab testing can go
- Treatments and enhancements of Zambian EmeraldThe enhancements and treatments the GB/T and JJA/AGL tables list
- Caring for and wearing Zambian EmeraldCleaning, heat, chemicals and light, as the cited sources give them
- Hardness, density and refractive index of Zambian EmeraldEach value with its source and check date
- Zambian Emerald 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 Zambian EmeraldThe 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
'Zambian emerald' is a trade/commercial label for emerald (green beryl) that identifies a geographic origin rather than a mineral species. Its classic deposits fall in the tectonic-magmatic Type I, subtype IA category: beryllium-bearing pegmatites or quartz veins cut chromium-bearing ultramafic rocks, and abundant hydrothermal fluid flow with metasomatism concentrates the emerald in phlogopite reaction zones between quartz-tourmaline veins and metabasite. In central Zambia - the Kagem mine being one example - the orebodies lie within metabasic rocks of the Muva Supergroup that are Cr-rich (roughly 3,000-4,000 ppmw) and carry talc, chlorite, actinolite and magnetite; these are interpreted as metamorphosed komatiite. Roughly 70% of global production comes from subtype IA. As before, the origin name is a trade attribution and any such claim requires independent evidence.
Scope: Applies to explaining the geological setting of Zambian-type (type IA) emerald deposits and the boundary of 'Zambian' as a trade / origin name; not applicable to emeralds from other localities.
Sources CIBJO Gemstone Book 2022 · G&G Winter 2019
Where it forms
Be-bearing pegmatites/quartz veins intruding Cr-bearing ultramafic rocks (M-UMR), with large-scale hydrothermal fluid circulation and metasomatism.
Sources G&G Winter 2019
Phlogopite reaction zones between quartz-tourmaline veins and metabasite (where economic mineralisation concentrates).
Sources G&G Winter 2019
How it forms, step by step
Be-bearing pegmatites or quartz veins intrude Cr-bearing ultramafic rocks.
Hydrothermal fluid circulation drives metasomatism, altering mafic rocks to Mg-rich biotite schist and pegmatite to albite-rich plagioclasite.
Emerald and apatite precipitate in phlogopite reaction zones between quartz-tourmaline veins and metabasite.
Link to appearance
The supply of Cr and the phlogopite reaction-zone environment jointly control the green colour; the Cr-rich metabasic host rocks in Zambian orebodies are the principal source of the chromophore Cr.
Sources CIBJO Gemstone Book 2022 · G&G Winter 2019
Timescale
The selected source gives no specific mineralisation age or duration for Zambian emerald.
Sources CIBJO Gemstone Book 2022 · G&G Winter 2019
Related base materials
- Emerald (green beryl): trade-name-of | 'Zambian emerald' is a trade name for emerald based on geographic origin, not an independent mineral species
Supporting findings
In central Zambia, the Kagem mine included, emerald mineralisation is hosted by metabasic rocks of the Muva Supergroup whose talc, chlorite, actinolite and magnetite content is Cr-rich (roughly 3,000-4,000 ppmw); these rocks are interpreted as metamorphosed komatiite.
Evidence grade AScope: Host-rock characteristics of Type IA Zambian-style deposits; not applicable to other deposit types.
Type IA (tectonic-magmatic) deposits account for about 70% of worldwide production and are characterised by Be-bearing pegmatites or quartz veins intruding Cr-bearing ultramafic rocks with large-scale hydrothermal circulation and metasomatism (Brazil, Zambia, Russia and others).
Evidence grade AScope: A global production/type generalisation, not single-deposit data.
In Zambia, commercially significant emerald is largely confined to phlogopite reaction zones - usually 0.5-3 m across - that sit between quartz-tourmaline veins and metabasite.
Evidence grade AScope: A representative reaction-zone width for Type IA; not uniform for all orebodies.
Recorded localities
Authoritative sources name a single or principal locality.
Africa
- Kafubu mining district, Copperbelt, ZambiaAccounts for most of Zambia's production; the Kagem mine lies within it
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.
How it is identified
The appearance of Zambian emerald can closely match emeralds from other localities, and colour and appearance cannot prove its origin. Origin determination is a laboratory procedure based mainly on internal inclusion features and trace-element suites compared against reference data; origin conclusions carry overlap and uncertainty, and clarity treatments can complicate interpretation, so conclusions must be issued by an accredited laboratory. This entry gives no self-identification criteria or threshold.
Evidence grade AScope: Appearance is insufficient to settle origin; determination requires testing by an accredited laboratory, and this entry gives no self-test criteria or threshold.
In "Zambian emerald" the locality in the name is a trade attribution, not a determined origin. Origin labels for emerald (Zambia, for instance) are often used to support a premium, yet origin cannot be inferred from appearance or name. Origin determination is a comparison against reference databases of known localities: a laboratory measures trace-element suites by LA-ICP-MS and weighs internal inclusion features against specimens of documented provenance. The judgement is relative - the characteristic ranges of different localities overlap, deposits with no reference material cannot be assigned, and a single deposit is internally variable; treatment alters the measurable features, so treatment status must be settled first. An origin call must be issued by an accredited laboratory for a specific specimen, and "consistent with a locality" is not the same as "mined there"; nor does a place name in the trade prove quality.
Evidence grade AScope: Origin cannot be inferred from appearance or name; the locality in the name is a trade attribution, not a determined origin; a conclusion must be issued by an accredited laboratory for a specific specimen; no self-test criteria are given here.
Other research findings
'Zambian emerald' is a commercial/trade name for emerald historically associated with Zambian deposits; an origin claim requires independent evidence.
Evidence grade BScope: A naming-level boundary: a commercial name is not a test-confirmed provenance.
Sources CIBJO Gemstone Book 2022
Limits of this research
- Research status: Formation, occurrence or other material-specific findings found in authoritative sources
- Based on the Type IA model in the GIA deposit review; locality-by-locality differences in Zambia are not individually verified.
- Determining Zambian origin requires laboratory provenance analysis; this record provides no full diagnostic-criteria list.
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
- Emerald (any geographic-origin claim requires a laboratory opinion)
16 CFR Part 23 §23.1
Construction or treatment status
Natural identity; treatment status unknown
Treatments recorded for this material: 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
"Zambian Emerald" is a market name rather than a mineral species name; before using it, verify: Laboratory identification required before the name is used.
Evidence
What this means for you
Before buying, check the recommended listing name "Emerald (any geographic-origin claim requires a laboratory opinion)" 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
- Laboratory identification required before the name is used.
- Suggested listing name
- Emerald (any geographic-origin claim requires a laboratory opinion)
Care and wear
The item-by-item care advice that the GIA Care and Cleaning Guide gives for the whole class, and so for Zambian Emerald, is set out in full under care on the Emerald 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 |
|---|---|---|---|---|---|
| Filling | — | — | Graded — see §5.4.1, Table 1 | — | — |
| Dyeing | — | — | 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 Emerald)
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
How lab reports word it
Report wording for Zambian Emerald is set out under report wording on the Emerald entry.
VerifyNames, standards, technical facts, clauses and sources
Names
Chinese standard nameThe GB/T naming counterpart for Zambian Emerald is Emerald (GB/T 16552—2017), and Zambian Emerald itself is not listed in the standard. Trade and mineralogical namesZambian Emerald is a trade name for emerald associated with Zambian mines (origin or geographic association). Recommended listing nameThe suggested listing name is Emerald (origin requires a laboratory opinion). Institution usageOf GIA, FTC, CIBJO and Gem-A, the FTC and CIBJO source texts have no wording for this name (checked), and GIA and Gem-A have not been checked; the Zambian Emerald shown for bodies without a recorded wording is the entry's own English name and does not represent the position of GIA, FTC, CIBJO or Gem-A. Japanese namesThe Japanese GSJ wording for the Japanese name is not yet verified by this site, and the entry's own Japanese name means emerald from Zambia. Names in four languagesThe four-language names are given in Simplified Chinese, Traditional Chinese, English (Zambian Emerald) and Japanese. Trade and mineralogical namesThe mineralogical name is Emerald, historically associated with Zambian deposits.
- GSJ (Japan) formal name
- ザンビア産エメラルド (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)
- 祖母绿 (GB/T 16552—2017 §5.1.2.1 b))
- Mineralogical name
- Emerald historically associated with Zambian deposits
Four-language names
- 简体中文
- 赞比亚祖母绿
- 繁體中文
- 贊比亞祖母綠
- English
- Zambian Emerald
- 日本語
- ザンビア産エメラルド
See also: Misleading and prohibited trade names · Supplementary name index
Classification
- Origin
- Natural materials
- Material domain
- Natural inorganic gem materials
- Browsing family
- Beryl minerals and gem varieties
- Identity tier
- Trade name: geographic / origin-linked name
- Mineral chemical class
- Silicates
- Construction or treatment status
- Natural identity; treatment status unknown
Treatments listed by standards
The optimization and treatment entries for Zambian Emerald are applied by this site from the Emerald row of GB/T 16552—2017 Annex B, Table B.1: filling (listed by grade), dyeing (classed as treatment) and coating (classed as treatment). The notes to Table B.1 and the definitions of the filling grades are on this site's Gem treatments page; the full Emerald row with the effect column is on the Emerald entry.
GB/T 16552-2017, Annex B, Table B.1
Under the “Emerald” row of Table B.1: Filling Graded — see §5.4.1, Table 1; Dyeing Treatment; Coating Treatment. The full row, with the effect column, is on the Emerald 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
Among the registered material facts for Zambian Emerald, structure, durability, physical properties and optical items are taken for emerald as a whole (any origin), not measured on Zambian Emerald separately. For emerald as a whole (any origin): crystalline and hexagonal, often hexagonal prismatic; Mohs hardness 7.5–8; one direction of imperfect cleavage; density 2.67–2.9 g/cm³ (the cited clause giving 2.72 with a tolerance of +0.18/−0.05, from which the limits are derived); refractive index 1.56–1.6 (the cited clause giving 1.577–1.583 with a tolerance of ±0.017, from which the limits are derived); birefringence 0.005–0.009; anisotropic, uniaxial negative; pleochroism moderate to strong, bluish green and yellowish green, untreated; vitreous lustre, untreated. Chemical composition, fluorescence, UV-visible spectrum, infrared spectrum and magnification for emerald as a whole (any origin) are in the Emerald entry.
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 emerald as a whole (not one origin), so they are not repeated on the Zambian Emerald page; see the material facts on the Emerald entry.
Items below that name the class they cover give the cited clause’s value for that whole class, not a measurement of Zambian Emerald (how to read class-level values).
Structure
Zambian Emerald — structure (overall): crystalline
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Zambian Emerald — structure (crystal system): hexagonal
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Zambian Emerald — structure (crystal habit): common hexagonal
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Durability
Zambian Emerald — Mohs hardness: 7.5–8
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
- emerald as a whole (not one origin)
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Zambian Emerald — cleavage: imperfect in one direction
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Physical properties
Zambian Emerald — density: 2.67–2.9 g/cm³
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
- Qualification
The clause we cite gives 2.72, with a stated tolerance of +0.18 / -0.05. The range shown here is worked out from that.
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Optical
Zambian Emerald — optic character: uniaxial, optically negative (anisotropic)
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Zambian Emerald — refractive index: 1.56–1.6
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
- Qualification
The clause we cite gives 1.577–1.583, with a stated tolerance of ±0.017. The range shown here is worked out from that.
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Zambian Emerald — birefringence: 0.005–0.009
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Zambian Emerald — pleochroism: blue-green and yellow-green, moderate to strong
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Zambian Emerald — optical effect (chatoyancy): seen
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Zambian Emerald — optical effect (asterism): seen; rare
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
- CIBJO definitions
- chatoyancy, asterism
Quality factors
Zambian Emerald — quality factor (lustre): vitreous
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- What this covers
- emerald as a whole (not one origin)
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.7 (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): 1.58 / 2.79; Closest values: 1Qingtian Stone 1.565 / 2.77, 2Natural Conch Pearl / Natural Melo Pearl 1.595 / 2.84, 3Calcite 1.572 / 2.7, 4Brucite 1.57 / 2.89, 5Synthetic Emerald 1.565 / 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 Zambian Emerald under “Emerald” (§6.1.30): see identification on the Emerald entry; the required tests are listed on the CIBJO laboratory protocol table for Emerald.
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 § 23.1 — Deception (general). 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 Beryl on this site: 11 entries listed by this site's parent-entry links; synthetic, treated and similar entries carry their recorded state after the name; this page (Zambian Emerald) is marked.
- Beryl
Sub-entries (9)
- Aquamarine
- Colombian Emerald
- Emerald
Sub-entries (1)
- Synthetic Emerald (Synthetic product)
- Goshenite
- Heliodor / Golden Beryl
- Maxixe Beryl
- Morganite
- Red Beryl
- Zambian Emerald
This table scrolls sideways on narrow screens.
| Page | Content | Status |
|---|---|---|
| Browsing family | Beryl minerals and gem varieties | Live |
| Treatments recorded for this material | 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 Zambian Emerald 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.