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Artificial products / Manufactured products · Artificial product type · Synthetic product
Synthetic Diamond
Also known asLaboratory-grown diamond (conditional name)
Synthetic (laboratory-grown) diamond; GB/T 16552-2017 Annex A Table A.4 lists it as "synthetic diamond", and the qualifier must sit right next to the name and be equally prominent. Also known as Laboratory-grown diamond. 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 Synthetic Diamond forms and what gives its colourFormation setting, process and timescale, each finding graded and sourced
- How to identify Synthetic DiamondIdentification points from the research literature
- Hardness, density and refractive index of Synthetic DiamondEach value with its source and check date
- Synthetic Diamond 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: Do GIA, FTC, CIBJO and Gem-A use the same wording for it?
- Listing and disclosing Synthetic DiamondThe listing name to use; what must be disclosed before sale
- Standard clauses that define Synthetic DiamondWhich 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
A synthetic diamond — the term laboratory-grown diamond is used as well — is an artificial diamond produced in a laboratory, matching natural diamond in crystal structure, physical properties and chemical composition. Growth begins from a diamond seed that acts as a template, and two methods dominate. In high-pressure, high-temperature (HPHT) growth, a solid carbon source, graphite powder for instance, is held in a metallic flux at roughly 5–6 GPa and 1300–1600°C, and diamond grows there. In chemical vapor deposition (CVD), hydrogen together with hydrocarbon gases deposit diamond onto seeds inside a microwave plasma. High-temperature treatment after growth is commonly applied to take out brown colour, and cutting and polishing follow. The whole process is man-made and involves no natural geological formation.
Scope: Applies to describing synthetic diamond materials manufactured by artificial methods (HPHT and CVD) and their separation from natural diamond; does not apply to descriptions of the genesis of natural diamond, and does not cover price or investment value judgements.
Sources G&G Summer 2024 · CIBJO Gemstone Book 2022 · G&G Summer 2020 +1
- Laboratory-Grown Diamonds: An Update on Identification and Products Evaluated at GIA (Gems & Gemology, Summer 2024, Vol. 60, No. 2)
- CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022)
- Separation of Natural from Laboratory-Grown Diamond Using Time-Gated Luminescence Imaging (Gems & Gemology, Summer 2020, Vol. 56, No. 2)
- Features of Synthetic Diamonds (Gems & Gemology, Summer 2018, Vol. 54, No. 2)
Where it forms
Not applicable to any natural setting: synthetic diamond does not form in nature. Its process environment is a laboratory HPHT press (about 5–6 GPa, 1300–1600°C) or a CVD reactor (hydrogen-hydrocarbon plasma, microwave activated).
Sources G&G Summer 2024 · CIBJO Gemstone Book 2022 · G&G Summer 2020 +1
- Laboratory-Grown Diamonds: An Update on Identification and Products Evaluated at GIA (Gems & Gemology, Summer 2024, Vol. 60, No. 2)
- CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022)
- Separation of Natural from Laboratory-Grown Diamond Using Time-Gated Luminescence Imaging (Gems & Gemology, Summer 2020, Vol. 56, No. 2)
- Features of Synthetic Diamonds (Gems & Gemology, Summer 2018, Vol. 54, No. 2)
The mimicked counterpart (not this product's setting): natural diamond forms at high pressure and temperature about 150–190 km deep in Earth's mantle; this describes only the natural counterpart being imitated, not the synthetic diamond itself.
Sources G&G Summer 2024 · CIBJO Gemstone Book 2022 · G&G Summer 2020 +1
- Laboratory-Grown Diamonds: An Update on Identification and Products Evaluated at GIA (Gems & Gemology, Summer 2024, Vol. 60, No. 2)
- CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022)
- Separation of Natural from Laboratory-Grown Diamond Using Time-Gated Luminescence Imaging (Gems & Gemology, Summer 2020, Vol. 56, No. 2)
- Features of Synthetic Diamonds (Gems & Gemology, Summer 2018, Vol. 54, No. 2)
How it forms, step by step
Prepare the diamond seed and carbon source (solid carbon such as graphite powder for HPHT; carbon-bearing gas such as methane for CVD).
HPHT method: in a capsule containing the carbon source, a metallic flux, and a seed, apply about 5–6 GPa and 1300–1600°C so carbon supersaturates and crystallizes out of the metal solution onto the seed.
CVD method: activate a hydrogen-hydrocarbon plasma by microwaves in a reactor so carbon-bearing species deposit layer by layer onto the seed surface.
Post-growth treatment: HPHT treatment is commonly applied to remove the brown color produced during growth and improve color grade.
Cutting and polishing: fashion the grown crystal into a faceted gemstone.
Link to appearance
Colorless to near-colorless synthetic diamonds look similar to natural diamonds and are hard to separate by eye; their color and clarity depend on growth conditions and post-growth treatment. Synthetic diamonds may be colorless, near-colorless, or variously colored.
Sources CIBJO Gemstone Book 2022
Timescale
One HPHT diamond normally needs an hour up to a few weeks to grow; a large CVD crystal may need months — a crystal that yielded a 75.33 ct stone is reported to have taken nine months.
Sources G&G Summer 2024
Supporting findings
Synthetic diamond can be manufactured by the high-pressure, high-temperature (HPHT) method, in which a solid carbon source such as graphite powder grows in a metallic flux at about 5–6 GPa and 1300–1600°C.
Evidence grade AScope: Covers HPHT-lab manufacture of synthetic diamond; excludes natural formation.
Synthetic diamond can be manufactured by chemical vapor deposition (CVD), in which hydrogen and hydrocarbon gases deposit diamond layer by layer on a seed in a microwave plasma.
Evidence grade AScope: Covers CVD-lab manufacture of synthetic diamond; excludes natural formation.
An HPHT stone generally needs between one hour and several weeks to grow, whereas large CVD crystals may take as long as several months.
Evidence grade AScope: Covers growth duration only; no natural-diamond timescale.
How it is identified
Synthetic (laboratory-grown) diamond looks practically identical to natural diamond, and routine gemological checks are often insufficient to separate them. A laboratory relies on ultraviolet fluorescence and phosphorescence observation, deep-ultraviolet imaging, and infrared and photoluminescence spectroscopy, judged together with growth features; screening devices give only an indicative result, and the final call must come from an accredited laboratory.
Evidence grade AScope: Synthetic diamond determinations require an accredited laboratory; screening device results are indicative only.
Sources G&G Winter 1995
Other research findings
CIBJO's definition makes a synthetic diamond an artificial product whose chemical composition, physical properties and structure match those of its natural counterpart essentially; naming must therefore disclose it as synthetic, laboratory-created or laboratory-grown.
Evidence grade AScope: Covers identity and nomenclature rules for synthetic diamond; not specific growth methods.
Sources CIBJO Gemstone Book 2022
Colorless to near-colorless synthetic diamonds are type II (no nitrogen detectable by infrared), unlike the overwhelming majority of natural diamonds, providing a first basis for identification.
Evidence grade AScope: Applies to screening of colorless to near-colorless synthetic diamond; not to every colored or treated sample.
Sources G&G Summer 2024 · G&G Summer 2020
This entry (Synthetic Diamond) and the Laboratory-Grown Diamond entry describe one and the same laboratory-grown diamond material and can be read together; since CIBJO holds "synthetic", "laboratory-created" and "laboratory-grown" to be synonymous, the two are not separate materials.
Evidence grade AScope: Defines the relationship between the two entries; an entry-management note, not a material origin.
Sources CIBJO Gemstone Book 2022
The first gem-quality synthetic diamonds were produced by the HPHT method; GIA began issuing synthetic diamond grading reports in 2007, after which CVD products gradually came to dominate submissions.
Evidence grade AScope: Covers the industry/identification history of synthetic diamond; excludes natural formation.
A synthetic (laboratory-grown) diamond can be described by the same 4Cs — Color, Clarity, Cut and Carat Weight — but in identification and grading it must be strictly distinguished from natural diamond: a laboratory report must name it laboratory-grown/synthetic, and its colour cause is tied to its growth method (HPHT or CVD), unlike natural diamond. Their assessment and description systems are therefore not equivalent: the material's identity must be established before quality is discussed; the 4Cs describe diamonds and do not apply to coloured gemstones.
Evidence grade AScope: Quality factors describe which characteristics the market generally prizes; they are not a grade for any specific specimen and are neither price nor investment advice. The 4Cs system applies to diamonds and is not transferable to coloured gemstones.
Sources G&G Summer 2024 · GIA Diamond Quality Factors
Limits of this research
- Research status: Formation, occurrence or other material-specific findings found in authoritative sources
- The available sources do not quantify the price difference or investment value between synthetic and natural diamonds, so no market claim is made.
- Growth and post-growth details vary by producer and batch and are often undisclosed; the sources do not enumerate them.
- Submission-trend data are based on GIA laboratory intake and may differ from global statistics (as the source notes).
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
- Synthetic Diamond
GB/T 16552—2017 Table A.4 “Synthetic Diamond” · CIBJO Gemstone Book 2022 4.3.3.1
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
"Synthetic Diamond" 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.4, row 合成钻石 (Synthetic Diamond)
What this means for you
Before buying, check the recommended listing name "Synthetic Diamond" 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
- Synthetic Diamond
Care and wear
No care facts are recorded for this entry itself. Its parent material has care records: see Diamond.
VerifyNames, standards, technical facts, clauses and sources
Names
Besides Synthetic Diamond, the name register records "Laboratory-grown diamond", for which no restriction on use as a name is recorded; 3 further names in non-Latin scripts are listed in the name register below (1 with no restriction recorded on use as a name, 2 that must not be used as a name).
Standard and listing namesThe GB/T 16552—2017 formal name for Synthetic Diamond is given in Table A.4, and the suggested listing name is also Synthetic Diamond; the mineralogical name and the trade name/synonym are registered as Laboratory-grown diamond. Names in four languagesNames are given in Simplified Chinese, Traditional Chinese, English (Synthetic Diamond) and Japanese. Institution usageOn authority wording, GIA lists Laboratory-grown Diamond, FTC lists Laboratory-created Diamond, and CIBJO and Gem-A both list Synthetic Diamond; FTC also has a qualifier stripped from its headline name, concerning the definition of diamond and qualified naming. Japanese namesThe entry has its own Japanese name, and the wording used by GSJ (Japan) for it is not yet verified by this site. National standard namesGermany (RAL) uses Synthetischer Diamant; the European Union uses Laboratory-grown Diamond and requires synthetisch or im Labor gezüchtet; Australia (GAA) uses Laboratory-grown Diamond with mandatory disclosure under the Competition & Consumer Act 2010. Chinese standard nameCVD diamond and HPHT diamond are not usable names, as GB/T 16552—2017 states that the synthesis method should not be used directly in the name. Candidate search termsAn alternative Chinese term for synthetic diamond, using the mineral name for diamond, appears in the GB/T 16552 revision draft for comment (2023, not in force) and is a search candidate only; Laboratory-grown diamond is a market name and a search candidate only.
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 (2) | ||||
| Laboratory-grown diamondEnglish | market name | search candidate only | no restriction recorded | editorial ruling (no clause cited) |
| 合成金刚石Simplified Chinese | synonym | search candidate only | no restriction recorded | GB/T 16552 revision draft for comment (2023, not in force) Table A.4; GB/T 16552—2017 Table A.4 “Synthetic Diamond”; Note: Draft standard for comment, not in force. |
| not to be used as a name (2) | ||||
| CVD钻石Simplified Chinese | market name | matched automatically | not to be used as a name | GB/T 16552—2017 5.1.3.1 d); Note: GB/T 16552—2017 §5.1.3.1 d) uses it as the example of a rule: the synthesis method must not be used directly as the name (a counter-example, not a trade name); the standard name is synthetic diamond. |
| HPHT钻石Simplified Chinese | market name | search candidate only | not to be used as a name | GB/T 16552—2017 5.1.3.1 d); Note: GB/T 16552—2017 §5.1.3.1 d) uses it as the example of a rule: the synthesis method must not be used directly as the name (a counter-example, not a trade name); HPHT is also a treatment applied to natural diamonds. |
How each authority words this name: see Names › Authority wording.
- GSJ (Japan) formal name
- 合成ダイヤモンド (not yet checked for this body — the entry's own Japanese name is shown)
- Chinese formal name
- 合成钻石 (GB/T 16552—2017 Table A.4)
- Mineralogical name
- Laboratory-grown diamond
- Trade names and synonyms
- Laboratory-grown diamond (market name; conditional name)
Four-language names
- 简体中文
- 合成钻石
- 繁體中文
- 合成鑽石
- English
- Synthetic Diamond
- 日本語
- 合成ダイヤモンド
National and regional formal names
- Germany (RAL)
- Synthetischer Diamant
- European Union
- Laboratory-grown Diamond (EU: "synthetisch" or "im Labor gezüchtet" required)
- Australia (GAA)
- Laboratory-grown Diamond; Competition & Consumer Act 2010: mandatory disclosure
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
- Synthetic gem products
- Identity tier
- Artificial product type
- Mineral chemical class
- Mixed / composition-dependent
- Construction or treatment status
- Synthetic product
What it is and how it's identified
The registered material facts for Synthetic Diamond are sourced from GB/T 16553—2017: chemical composition is C, which may contain trace elements such as N, B, H, Si and Ni; the structure is crystalline, cubic. Crystal habit varies with the synthesis method: HPHT synthetic diamond (high pressure, high temperature) commonly shows combinations of the octahedron {111} and cube {100}, with dendritic or stepped growth striations often seen on the faces; CVD synthetic diamond (chemical vapour deposition) is tabular, with well-developed {100} faces and undeveloped {111} and {110} faces. Mohs hardness is 10 and cleavage is moderate; this site notes that hardness alone is not enough to judge durability. Density is 3.51–3.53 g/cm³; the cited clause gives 3.52 with a tolerance of ±0.01, from which the range is derived. Optically, optical character is isotropic, with anomalous extinction common in CVD-grown diamond; refractive index is 2.417, and birefringence is registered as none. Untreated Synthetic Diamond shows no pleochroism, and its lustre (quality factor) is adamantine.
Numbers in curly braces, such as {111}, are crystallographic face symbols (Miller indices): each marks a set of crystal faces or cleavage planes. They are reproduced as written in the cited source.
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
Synthetic Diamond — composition (chemistry): C;trace elements such as N,B,H,Si and Ni may be contained.
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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Structure
Synthetic Diamond — 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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — 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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — structure (crystal habit): High-pressure high-temperature synthetic diamond (HPHT synthetic diamond for short) commonly occurs as a combination of the octahedron {111} and the cube {100}, and its crystal faces often develop dendritic or step-like growth striations.
Diamond synthesized by chemical vapour deposition (CVD synthetic diamond for short) is platy, with the {100} face developed and the {111} and {110} faces undeveloped.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-22
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.1 (locator checked 2026-09-22)
- Fact checked on
- 2026-09-22
Durability
Synthetic Diamond — Mohs hardness: 10
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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — cleavage: moderate
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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Physical properties
Synthetic Diamond — density: 3.51–3.53 g/cm³
GB/T 16553—2017
- Does this standard apply
- applies to this entry
- Qualification
The clause we cite gives 3.52, with a stated tolerance of ±0.01. The range shown here is worked out from that.
Source & check 2026-09-21
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Optical
Synthetic Diamond — optic character: isotropic; CVD-grown synthetic diamonds commonly show anomalous extinction.
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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — refractive index: 2.417
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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — 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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — 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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — fluorescence (long-wave UV): HPHT synthetic diamond: generally none; CVD synthetic diamond: weak, orange-yellow; weak, yellow-green; none.
GB/T 16553—2017
UV fluorescence (long-wave UV)orange-yellowweak, CVD synthetic diamondyellow-greenweak, CVD synthetic diamondDots 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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — fluorescence (short-wave UV): HPHT synthetic diamond: generally none to strong, pale yellow, orange-yellow, green-yellow, green-blue; uneven; partly phosphorescent; CVD synthetic diamond: weak, orange-yellow; weak, yellow-green; none; short wave is usually stronger than long wave.
GB/T 16553—2017
UV fluorescence (short-wave UV)generally: pale yelloworange-yellowgreen-yellowgreen-bluenone–strong, HPHT synthetic diamondorange-yellowweak, CVD synthetic diamondyellow-greenweak, CVD synthetic diamondDots 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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — spectrum (UV-visible): yellow HPHT synthetic diamond: 550 nm absorption increasing towards short wave; colourless synthetic diamond: generally visible 270 nm absorption peak.
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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — spectrum (infrared): The intrinsic peaks of synthetic diamond fall between 1 500 cm⁻¹ and 2 680 cm⁻¹; the characteristic infrared absorption bands produced by C-C bond vibration sit at 2 030 cm⁻¹, 2 160 cm⁻¹ and 2 350 cm⁻¹.
By type, HPHT-grown stones are mostly Type Ⅰb when yellow, Type Ⅱa or Ⅱa + Ⅱb when colourless, and Type Ⅱb when blue; CVD synthetic diamond is mainly Type Ⅱa, turning into Type Ⅰb when nitrogen is added during synthesis and Type Ⅱb when boron is added.
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-22
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.1 (locator checked 2026-09-22)
- Fact checked on
- 2026-09-22
Synthetic Diamond — spectrum (Raman): Synthetic diamond shows its characteristic Raman peak at 1 332 cm⁻¹.
As to photoluminescence (PL): HPHT synthetic diamond mostly carries luminescent peaks from Ni defects, with double peaks at 883.2 nm and 884.9 nm commonly seen at low temperature (liquid nitrogen); CVD synthetic diamond mostly carries luminescent peaks tied to [Si-V] defects, with double peaks at 737.6 nm and 737.9 nm that may be seen at low temperature (liquid nitrogen).
GB/T 16553—2017
- Does this standard apply
- applies to this entry
Source & check 2026-09-22
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.1 (locator checked 2026-09-22)
- Fact checked on
- 2026-09-22
Synthetic Diamond — magnification: metal inclusions visible in HPHT-grown synthetic diamond, clouds of pinpoint inclusions, colour bands or blocks that follow the growth sectors, in CVD-grown synthetic diamond, pinpoint inclusions may be present.
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): §5.4.1 (locator checked 2026-09-21)
- Fact checked on
- 2026-09-21
Synthetic Diamond — body colour: yellow, colorless, blue, purple-red, brown-yellow, etc.
GB/T 16553—2017
- Treatment state
- untreated
- Does this standard apply
- applies to this entry
- Qualification
The colours GB/T 16553—2017 lists for Diamond overlap with this entry: yellow, colourless, blue and purplish red.
- General note
- colour alone is not identity
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.4.1 (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Quality factors
Synthetic Diamond — quality factor (lustre): adamantine
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): §5.4.1 (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): 2.417 / 3.52; Closest values: 1Sphalerite 2.369 / 4, 2Synthetic Moissanite 2.67 / 3.22, 3Artificial Strontium Titanate 2.409 / 5.13, 4Rutile 2.753 / 4.23, 5Synthetic Rutile 2.76 / 4.26
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
At clause level in GB/T 16552-2017 Annex A, Synthetic Diamond is registered under the term Synthetic Diamond, with the definition Laboratory-grown diamond; the cross-check shows that GB/T lists the name directly, while no standalone CIBJO entry under the same name was found.
This table scrolls sideways on narrow screens.
| Term | Clause | Definition | Cross-check |
|---|---|---|---|
| Synthetic Diamond | GB/T 16552-2017 Annex A | Laboratory-grown diamond | 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.
Related-entry tree for Diamond on this site: 4 entries listed by this site's parent-entry links; synthetic, treated and similar entries carry their recorded state after the name; this page (Synthetic Diamond) is marked.
- Diamond
Sub-entries (3)
- Black Diamond (treated)
- Fancy Color Diamond
- Synthetic Diamond (Synthetic product)
This table scrolls sideways on narrow screens.
| Page | Content | Status |
|---|---|---|
| Browsing family | Synthetic gem products | Live |
| Related articles | To be added (placeholder) | Planned |
Who maintains this page
The material facts in the Synthetic Diamond 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.