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Artificial products / Manufactured products · Artificial product type · Artificial material with no natural counterpart
Artificial Gadolinium Gallium Garnet (GGG)
Also known asGGG
A man-made Gd3Ga5O12 crystal with no natural gem counterpart; GB/T 16552-2017 Annex A Table A.5 lists it as "man-made gadolinium gallium garnet". 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 Artificial Gadolinium Gallium Garnet (GGG) forms and what gives its colourFormation setting, process and timescale, each finding graded and sourced
- Caring for and wearing Artificial Gadolinium Gallium Garnet (GGG)Cleaning, heat, chemicals and light, as the cited sources give them
- Hardness, density and refractive index of Artificial Gadolinium Gallium Garnet (GGG)Each value with its source and check date
- Artificial Gadolinium Gallium Garnet (GGG) in English, Chinese and Japanese; national standard namesNames in four languages, the GB/T standard name and the suggested listing name, names in national standards; and: Which of GIA, FTC, CIBJO and Gem-A have a name for it on record, and do those agree?
- Listing and disclosing Artificial Gadolinium Gallium Garnet (GGG)The listing name to use; what must be disclosed before sale
- Standard clauses that define Artificial Gadolinium Gallium Garnet (GGG)Which 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
Synthetic gadolinium gallium garnet (GGG, Gd3Ga5O12) is a man-made crystallised material with no known natural counterpart gem. Together with synthetic yttrium aluminium garnet (YAG), it has been used as a diamond simulant since the 1960s and can be made in a variety of colors. CIBJO names gadolinium gallium garnet (GGG) next to YAG and expressly treats it as a man-made crystal for which nature offers no equivalent. GGG is therefore not a mined gemstone and is not formed in nature; its manufacture is artificial crystal growth.
Scope: Applies to explaining GGG as a man-made crystalline product with no natural counterpart, its positioning as a simulant and its naming requirements; does not apply to descriptions of natural genesis.
Sources CIBJO Gemstone Book 2022 · GIA Introduction to Imitation Gems
Where it forms
Manufacturing environment: artificial crystal growth (single-crystal Gd3Ga5O12 grown in a laboratory/factory); no natural occurrence environment applies to this record.
Sources CIBJO Gemstone Book 2022 · GIA Introduction to Imitation Gems
Not applicable to a natural occurrence environment: GGG has no known natural counterpart, and no gem-quality natural occurrence exists.
Sources CIBJO Gemstone Book 2022 · GIA Introduction to Imitation Gems
How it forms, step by step
Prepare the gadolinium- and gallium-oxide feedstock in the Gd3Ga5O12 stoichiometric ratio.
Sources CIBJO Gemstone Book 2022 · GIA Introduction to Imitation Gems
Grow a single crystal of gadolinium gallium garnet at high temperature by an artificial crystal-growth method.
Sources CIBJO Gemstone Book 2022 · GIA Introduction to Imitation Gems
(Optional) adjust color by doping to obtain crystals of different colors.
Sources CIBJO Gemstone Book 2022 · GIA Introduction to Imitation Gems
Cut and polish into finished gems or diamond imitation stones.
Sources CIBJO Gemstone Book 2022 · GIA Introduction to Imitation Gems
Link to appearance
GGG's appearance as a diamond imitation comes from its colorless, high-refraction crystal look; it can be made in a variety of colors to imitate different gems.
Sources GIA Introduction to Imitation Gems
Timescale
The source states GGG joined classic diamond simulants in the 1960s (the material's introduction era, not a geological timescale).
Sources GIA Introduction to Imitation Gems
Other research findings
CIBJO names gadolinium gallium garnet (GGG) next to yttrium aluminium garnet (YAG) and expressly treats both as man-made crystals for which nature offers no equivalent.
Evidence grade AScope: Applies to GGG's classification as an artificial stone with no natural counterpart; not to a specific specimen.
Sources CIBJO Gemstone Book 2022
CIBJO requires the name of a man-made crystal with no natural equivalent to be accompanied by 'artificial product' or 'artificial stone', given the same emphasis and prominence as the name.
Evidence grade AScope: Applies to the naming and disclosure of GGG and similar artificial stones; not a value judgment.
Sources CIBJO Gemstone Book 2022
In the 1960s, gadolinium gallium garnet (GGG) and its 'cousin' yttrium aluminium garnet (YAG) joined classic diamond simulants such as glass, natural zircon, and colorless synthetic spinel.
Evidence grade AScope: Applies to the historical development of synthetic diamond simulants; not to geologic origin.
Sources GIA Introduction to Imitation Gems
Synthetic gadolinium gallium garnet is available in a variety of colors; colorless GGG is cited alongside colorless YAG among classic diamond-simulant materials.
Evidence grade AScope: Applies to GGG's color range and simulant use; not to a specimen's color grade.
Sources GIA Introduction to Imitation Gems
Limits of this research
- Research status: Only partial material-specific findings found; gaps are stated as gaps
- The cited sources do not give the specific crystal-growth method or process parameters for GGG.
- The sources record no per-specimen chemical composition or doping formulation for GGG.
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
- Man-made Gadolinium Gallium Garnet (GGG)
GB/T 16552—2017 Table A.5 “Gadolinium Gallium Garnet(GGG)” · CIBJO Gemstone Book 2022 4.3.4.1
Construction or treatment status
Artificial material with no natural counterpart
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
"Artificial Gadolinium Gallium Garnet (GGG)" is a market name rather than a mineral species name; before using it, verify: Not a mineral: man-made or non-mineral material.
Evidence
- GB/T · Table A.5, row 人造钆镓榴石 (Gadolinium Gallium Garnet (GGG))
What this means for you
Before buying, check the recommended listing name "Man-made Gadolinium Gallium Garnet (GGG)" 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
- Not a mineral: man-made or non-mineral material.
- Suggested listing name
- Man-made Gadolinium Gallium Garnet (GGG)
Care and wear
Care
Artificial Gadolinium Gallium Garnet — care (cleaning): in its GGG entry, GIA's care line lists ultrasonic (and steam) cleaning as usually safe.
GIA 4Cs blog (2016)
- Treatment state
- any treatment state
Source & check 2026-10-06
- Source
- GIA 4Cs blog, “What Are Simulated Diamonds?” (2016-12-20): Section: main text (locator checked 2026-10-06)
- Fact checked on
- 2026-10-06
Artificial Gadolinium Gallium Garnet — care (wear): GIA says GGG's low hardness leaves it fairly prone to scratches, and its facet edges are often worn round.
GIA 4Cs blog (2016)
- Treatment state
- any treatment state
Source & check 2026-10-06
- Source
- GIA 4Cs blog, “What Are Simulated Diamonds?” (2016-12-20): Section: main text (locator checked 2026-10-06)
- Fact checked on
- 2026-10-06
Each row's “Source & check” expands to the full source; the date beside it is the fact check date.
Common care questions and matching entries
Each question links to the matching entries on this page; whether they answer it fully, go by the entry wording.
This table scrolls sideways on narrow screens.
| Question | Matching entries |
|---|---|
| Can it go in an ultrasonic or steam cleaner? | in its GGG entry, GIA's care line lists ultrasonic (and steam) cleaning as usually safe |
| Wearing limits (knocks, settings) | GIA says GGG's low hardness leaves it fairly prone to scratches, and its facet edges are often worn round |
VerifyNames, standards, technical facts, clauses and sources
Names
Besides Artificial Gadolinium Gallium Garnet (GGG), the name register records "GGG", for which no restriction on use as a name is recorded.
Standard and listing namesThe Chinese formal name for Artificial Gadolinium Gallium Garnet (GGG) comes from GB/T 16552—2017 Table A.5; the trade name and synonym is the English abbreviation GGG, and the suggested listing name is Man-made Gadolinium Gallium Garnet (GGG). Names in four languagesThe four-language names are the Simplified Chinese name, the Traditional Chinese name, the English name Artificial Gadolinium Gallium Garnet (GGG) and the Japanese name. The wording of GSJ (Japan) for this name is not yet verified by this site; the entry's own Japanese name is shown, which does not represent the position of GSJ (Japan). Institution usageOn authority wording, CIBJO lists Artificial product: GGG, with the qualification stripped from its heading name being that it has no natural counterpart; the FTC text on file has no wording for this name (checked); the wording of GIA and Gem-A is not yet verified by this site, and the entry's own English name is shown, which does not represent the position of GIA or Gem-A. National standard namesGermany (RAL) writes Künstlicher GGG and the EU writes Artificial GGG. Trade and mineralogical namesThe mineralogical name is a man-made Gd3Ga5O12 crystal with no natural gem counterpart.
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 |
|---|---|---|---|---|
| no restriction recorded (1) | ||||
| GGGEnglish | short form | matched automatically | no restriction recorded | editorial ruling (no clause cited) |
How each authority words this name: see Names › Authority wording.
- GSJ (Japan) formal name
- GGG／ガドリニウム・ガリウム・ガーネット (not yet checked for this body — the entry's own Japanese name is shown)
- Chinese formal name
- 人造钆镓榴石 (GB/T 16552—2017 Table A.5)
- Mineralogical name
- Manufactured Gd3Ga5O12 crystal with no natural gem counterpart
- Trade names and synonyms
- GGG (short form)
Four-language names
- 简体中文
- 人造钆镓榴石
- 繁體中文
- 人造釓鎵榴石
- English
- Artificial Gadolinium Gallium Garnet (GGG)
- 日本語
- GGG／ガドリニウム・ガリウム・ガーネット
National and regional formal names
- Germany (RAL)
- Künstlicher GGG
- European Union
- Artificial GGG
Qualifiers stripped from the headline name
See also: Misleading and prohibited trade names · Supplementary name index
Classification
- Origin
- Artificial products / Manufactured products
- Material domain
- Artificial products / Manufactured products
- Browsing family
- Artificial gem products with no natural counterpart
- Identity tier
- Artificial product type
- Mineral chemical class
- Mixed / composition-dependent
- Construction or treatment status
- Artificial material with no natural counterpart
What it is and how it's identified
The registered material facts for man-made Gadolinium Gallium Garnet (GGG): composition Gd3Ga5O12, crystalline, cubic, with a massive crystal habit. Mohs hardness 6–7, cleavage none; this site notes that hardness alone is not enough to judge durability. Density 6.95–7.09 g/cm³, from the clause value 7.05 with tolerance +0.04/−0.10, from which the range is derived. Optic character isotropic, birefringence none, dispersion 0.045; refractive index 1.97–2.03, from the clause value 1.970 with tolerance +0.060, from which the range is derived. In the untreated state, pleochroism is none, body colour is usually colourless to light brown or yellow, lustre is vitreous to subadamantine, and magnification shows gas bubbles and triangular platy metallic inclusions. The UV-visible spectrum is not diagnostic, and the mid-infrared region shows the characteristic infrared absorption bands of man-made gadolinium gallium garnet.
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”.
Definition
Artificial Gadolinium Gallium Garnet — composition (chemistry): Gd3Ga5O12
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Structure
Artificial Gadolinium Gallium Garnet — structure (overall): crystalline
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — structure (crystal system): cubic
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — structure (crystal habit): blocky
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Durability
Artificial Gadolinium Gallium Garnet — Mohs hardness: 6–7
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
- General note
- hardness only, not durability
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — cleavage: none
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Physical properties
Artificial Gadolinium Gallium Garnet — density: 6.95–7.09 g/cm³
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- Qualification
The clause we cite gives 7.05, with a stated tolerance of +0.04 / -0.10. The range shown here is worked out from that.
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Optical
Artificial Gadolinium Gallium Garnet — optic character: isotropic material
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — refractive index: 1.97–2.03
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- Qualification
The clause we cite gives 1.970, with a stated tolerance of +0.060. The range shown here is worked out from that.
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — birefringence: none
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — dispersion: 0.045
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — pleochroism: none
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — fluorescence (overall): short wave moderate to strong, pink-orange
GB/T 16553—2017
UV fluorescencepink-orangemoderate–strongDots are illustrative colours built from the colour names, not measured values
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — spectrum (UV-visible): non-characteristic
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — spectrum (infrared): diagnostic bands of GGG in the mid-IR
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — magnification: bubble, triangular platy metallic inclusion
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Artificial Gadolinium Gallium Garnet — body colour: generally colorless to light brown or yellow
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- Qualification
In chapter 5 of GB/T 16553—2017, the colour entries of Cassiterite, Phenakite, Dolomite and other variety clauses also name colourless.
- General note
- colour alone is not identity
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Quality factors
Artificial Gadolinium Gallium Garnet — quality factor (lustre): vitreous to subadamantine
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.16 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Each row's “Source & check” expands to the full source; the date beside it is the fact check date.
This material (RI / SG midpoints): 2 / 7.02; Closest values: 1Cassiterite 2.046 / 6.95, 2Synthetic Cubic Zirconia 2.165 / 5.8, 3Artificial Yttrium Aluminium Garnet (YAG) 1.833 / 4.55, 4Artificial Strontium Titanate 2.409 / 5.13, 5Smithsonite 1.735 / 4.38
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
Clause-level definitions
The clause-level definition of man-made Gadolinium Gallium Garnet (GGG) rests on GB/T 16552-2017 Annex A, under the entry name Gadolinium Gallium Garnet (GGG), defined as a manufactured Gd3Ga5O12 crystal with no natural gem counterpart. Cross-check result: listed directly in GB/T; not found under a standalone heading of the same name in CIBJO.
This table scrolls sideways on narrow screens.
| Term | Clause | Definition | Cross-check |
|---|---|---|---|
| Gadolinium Gallium Garnet (GGG) | GB/T 16552-2017 Annex A | Manufactured Gd3Ga5O12 crystal with no natural gem counterpart | Listed directly by GB/T; CIBJO carries no standalone entry under the same name. |
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.
- 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.
This table scrolls sideways on narrow screens.
| Page | Content | Status |
|---|---|---|
| Browsing family | Artificial gem products with no natural counterpart | Live |
| Related articles | To be added (placeholder) | Planned |
Who maintains this page
The material facts in the Artificial Gadolinium Gallium Garnet (GGG) 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.