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
Beryllium-Diffused Sapphire
Also known asBe-diffused sapphire · Bulk diffusion sapphire
Sapphire treated by lattice diffusion of beryllium to produce colour that runs through the whole stone; the treatment must be disclosed at sale. Also known as Be-diffused sapphire, Bulk diffusion sapphire. 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 Beryllium-Diffused Sapphire 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 Beryllium-Diffused SapphireIdentification points from the research literature
- Treatments and enhancements of Beryllium-Diffused Sapphire1 registered treatments: status, stability, how common they are and identification leads
- Beryllium-Diffused Sapphire 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 Beryllium-Diffused SapphireThe 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
A beryllium-diffused sapphire is a sapphire that has undergone artificial diffusion treatment: beryllium (Be) is diffused into the corundum lattice at temperatures over 1800°C to introduce color. GIA's studies showed that the Be2+ ion itself is not the cause of color; when divalent beryllium replaces trivalent aluminium (Al3+), charge compensation requires the creation of a trapped hole (h•)—an oxygen ion carrying a single negative charge (O−)—and it is this ion that is the strong absorber, producing golden yellow or orange colors when associated with iron (Fe3+) or chromium (Cr3+) respectively. In natural corundum beryllium only rarely, if ever, enters the lattice, so such colors are not natural in origin. The material is a diffusion-treatment product, not a natural formation.
Scope: Used to describe corundum gems coloured by beryllium lattice diffusion treatment; emphasises that it is a diffusion-treated product, not a natural way of colouring corundum; the colour is caused by externally introduced beryllium and the trapped holes it induces.
Sources G&G Spring 2020 · CIBJO Gemstone Book 2022
Where it forms
Non-natural setting: the diffusion treatment is carried out artificially in a high-temperature furnace above 1800°C and does not occur in a geologic environment.
Sources G&G Spring 2020 · CIBJO Gemstone Book 2022
The host sapphire's natural origin is basalt-hosted or metamorphic corundum deposits; in natural corundum beryllium only rarely enters the lattice.
Sources G&G Spring 2020 · CIBJO Gemstone Book 2022
How it forms, step by step
The corundum is heat-treated above 1800°C so that external beryllium (Be) diffuses into the lattice (lattice diffusion).
Sources G&G Spring 2020 · CIBJO Gemstone Book 2022
Divalent Be2+ replaces trivalent Al3+, requiring charge compensation by a trapped hole h• (an oxygen ion carrying a single negative charge, O−).
Sources G&G Spring 2020 · CIBJO Gemstone Book 2022
The trapped hole associates with Fe3+ or Cr3+, producing golden yellow or orange colors respectively, completing the artificial coloration.
Sources G&G Spring 2020 · CIBJO Gemstone Book 2022
Link to appearance
After treatment the stone can show a wide color range from golden yellow to orange and pinkish tones; because coloration arises from the beryllium-induced trapped hole paired with iron/chromium, the color can be relatively uniform and differ from the zoning of natural corundum.
Sources G&G Spring 2020
Timescale
The sources give no absolute age for the host and no duration for the treatment; it takes place in a high-temperature furnace during processing.
Sources G&G Spring 2020 · CIBJO Gemstone Book 2022
Related base materials
- Sapphire (gem corundum other than ruby): part-of | The treated host is natural sapphire (corundum)
- Beryllium (Be), an external colour-inducing element: diffused-into | Beryllium, as an external element, diffuses into the corundum lattice at high temperature and causes colour
Causes of colour and optical effects
The Be2+ ion itself is not the cause of color; replacing trivalent aluminium with divalent beryllium requires a trapped hole (h•, an O–1 ion) for charge compensation, and it is this trapped hole that is the strong absorber.
Evidence grade AScope: An experimental finding on beryllium-diffused samples (Emmett et al., 2003); the mechanism is a laboratory-research conclusion.
The trapped hole associates with iron (Fe3+) or chromium (Cr3+), producing intense golden yellow or orange respectively; similar colors in natural corundum are largely induced by magnesium.
Evidence grade AScope: Because magnesium and beryllium are both divalent with similar substitution behaviour, magnesium-induced natural color and beryllium-diffused color are very similar.
How it is identified
The colour of beryllium-diffused sapphire comes from surface diffusion treatment, and it is hard to separate by colour from natural or merely heat-treated sapphire, since diffusion traces are usually confined to a near-surface layer. Testing is done in a laboratory, typically using trace-element compositional analysis such as LA-ICP-MS to measure beryllium and other elements near the surface, UV-visible-near-infrared spectroscopy, and immersion observation of colour distribution; whether diffusion occurred must be determined by an accredited laboratory, and this entry provides no self-test criterion or threshold.
Evidence grade AScope: Safety boundary: appearance is insufficient to decide diffusion treatment; determination requires testing by an accredited laboratory, and this entry gives no self-test criteria or threshold.
Origin determination concerns natural material, whereas beryllium-diffused sapphire is a product treated by beryllium diffusion, to which natural origin determination does not apply. For such material the treated or synthetic status must itself first be established by an accredited laboratory using instrumental testing; until then an origin discussion is meaningless. Origin cannot be inferred from appearance or name; and even where some natural material is involved, any origin claim must be issued by an accredited laboratory for a specific specimen. No self-test criteria are given here.
Evidence grade AScope: Origin cannot be inferred from appearance or name; natural origin determination does not apply to this material and its treated/synthetic status must first be established by a laboratory; any conclusion must be issued by an accredited laboratory for a specific specimen; no self-test criteria are given here.
Other research findings
Corundum treated by heating in a way that drives beryllium (Be) to diffuse through its crystal lattice, at temperatures above 1800°C, has grown into a significant concern for the gem trade.
Evidence grade AScope: GIA's account of the temperature condition of beryllium diffusion; the sources do not give all process parameters.
In natural corundum beryllium only rarely, if ever, enters the lattice, so colors produced by beryllium diffusion are not natural in origin (not an independent material).
Evidence grade AScope: GIA's statement on the occurrence of beryllium in natural corundum; identifying a specific treated stone must be done by a laboratory.
Diffusion treatment refers to colour and/or optical phenomena created by diffusion of chemical elements from an external source (excluding hydrogen and oxygen); the CIBJO trade code U denotes 'Diffusion treated'.
Evidence grade AScope: CIBJO's general definition of diffusion (5.24) and code U; it applies to diffusion-treated gems generally.
Sources CIBJO Gemstone Book 2022
Limits of this research
- Research status: Formation, occurrence or other material-specific findings found in authoritative sources
- The beryllium-diffusion content in GIA's chromophore article partly cites findings from the 2003 study it references.
- Identifying whether a given sapphire is beryllium-diffused must be done by a gem laboratory using advanced (e.g. spectroscopic) methods.
- The sources give no treatment duration and no absolute age for the host.
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
- Beryllium-diffused Sapphire
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), Dyed (via parent material), Filled / Fracture-filled (via parent material), Diffusion-treated, Irradiated (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
Under the naming rules of the Chinese standard (GB/T 16552—2017 §5.4.2.2 a)), Beryllium-Diffused Sapphire takes a composed Chinese name that differs from its common trade name; use "Beryllium-diffused Sapphire" for listings.
Evidence
What this means for you
Before buying, check the recommended listing name "Beryllium-diffused Sapphire" 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
- Composition or process must be stated.
- Suggested listing name
- Beryllium-diffused Sapphire
Treatments and identification leads
Values not givenThe treatment recorded for Beryllium-Diffused Sapphire is diffusion treatment, with status treated; stability and prevalence are both recorded as “—”, meaning the cited source gives no value, not “none”. Identification cluesIdentification leads include colour concentrated in fractures or cavities under magnification; by diffused element, Beryllium-Diffused Sapphire may show surface micro-crystallisation and recrystallised zircon inclusions, while cobalt-diffused sapphire may show light blue spots on the surface. Under immersion or diffused-light magnification, colour concentrated along facet edges, the girdle or fractures in a network pattern is mostly not obvious in Beryllium-Diffused Sapphire. Compositional analysis instruments (such as LA-ICP-MS) can detect anomalously high levels of beryllium and other diffused elements in the surface layer, decreasing from the surface inward. Source: GB/T 16553—2017.
This table scrolls sideways on narrow screens.
| Treatment | Market frequency (CIBJO) | Stability (CIBJO) | GB/T 16552 category | JJA/AGL listing | Identification leads |
|---|---|---|---|---|---|
| diffusion treatmentStatus: treated | — | — | Treatment | diffusion heat treatment | See identification leads 1; See identification leads 2 |
| Heating | — | — | Optimization | — | — |
| Dyeing | — | — | Treatment | — | — |
| Filling | — | — | Graded — see §5.4.1, Table 1 | — | — |
| Irradiation | — | — | Treatment | — | — |
Where each treatment acts (schematics): Diffusion-treated
“—” means the cited source gives no value for that item, not “none”. Source: GB/T 16553—2017; GB/T 16552—2017 Table B.1 (row for Sapphire); JJA/AGL 2025
Whether a treatment has to show in the name differs between the two rule sets (this site’s paraphrase):
- GB/T 16552—2017: a method classed as treatment has to be stated in the name itself — the method put before the name, or added in brackets after it; a method classed as optimization does not need to appear in the name, though one marked “Optimization (annotation required)” still has to be noted in the quality documents. Source: §5.4.2.1 a), b); §5.4.2.2 a)
- CIBJO Gemstone Book 2022: no longer splits treatments into ones that need specific disclosure and ones that need only general disclosure: every treatment is to be disclosed, and the seller tells the buyer which treatment was used and what special care it calls for. Source: §4.2.5 Note 2, §4.2.5.1, pp.14–15
VerifyNames, standards, technical facts, clauses and sources
Names
Besides Beryllium-Diffused Sapphire, the name register records "Be-diffused sapphire" and "Bulk diffusion sapphire", for which no restriction on use as a name is recorded.
Chinese standard nameUnder the GB/T 16552—2017 naming rules, the name built for Beryllium-Diffused Sapphire is "diffused sapphire", with the basic name "sapphire"; it is not listed separately in the original. Trade and mineralogical namesThe common market name is beryllium-diffused sapphire. Recommended listing nameThe suggested listing name is beryllium-diffusion-treated sapphire. Names in four languagesNames are given in Simplified Chinese, Traditional Chinese, English (Beryllium-Diffused Sapphire) and Japanese; the Japanese name is the entry's own, and the wording used by GSJ (Japan) for this name is not yet verified by this site. Trade and mineralogical namesThe mineralogical name refers to sapphire coloured by beryllium lattice diffusion. Institution usageThe FTC and CIBJO texts contain no wording for Beryllium-Diffused Sapphire (checked); the wording of GIA and Gem-A is unchecked. Bodies without a recorded wording show the entry's own English name, which does not represent their position. Trade and mineralogical namesTrade names/synonyms include Be-diffused sapphire and Bulk diffusion sapphire, treated as market names by this site's ruling, with no clause attached.
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) | ||||
| Be-diffused sapphireEnglish | market name | matched automatically | no restriction recorded | editorial ruling (no clause cited) |
| Bulk diffusion sapphireEnglish | market name | matched automatically | no restriction recorded | editorial ruling (no clause cited) |
How each authority words this name: see Names › Authority wording.
- GSJ (Japan) formal name
- ベリリウム拡散サファイア (not yet checked for this body — the entry's own Japanese name is shown)
- Name built by the GB/T naming rules (not listed as such)
- 扩散蓝宝石 (GB/T 16552—2017 §5.4.2.2 a); basic name 蓝宝石)
- Mineralogical name
- Sapphire coloured by beryllium lattice diffusion
- Trade names and synonyms
- Be-diffused sapphire (market name) · Bulk diffusion sapphire (market name)
Four-language names
- 简体中文
- 铍扩散蓝宝石
- 繁體中文
- 鈹擴散藍寶石
- English
- Beryllium-Diffused Sapphire
- 日本語
- ベリリウム拡散サファイア
See also: Misleading and prohibited trade names · Supplementary name index
Classification
- Origin
- Natural materials
- Material domain
- Natural inorganic gem materials
- Browsing family
- Oxide minerals
- Identity tier
- Trade name: colour / appearance variety
- Mineral chemical class
- Oxides / hydroxides
- Construction or treatment status
- Natural identity; treatment status unknown
Treatments listed by standards
GB/T Table B.1Beryllium-Diffused Sapphire is classified under GB/T 16552—2017 Annex B Table B.1 by applying the sapphire entry: heat treatment is listed as an enhancement, dyeing as a treatment, filling is considered separately by grade, diffusion treatment is listed as a treatment, and irradiation is listed as a treatment; the notes to Table B.1 and the definitions of the filling grades are on the treatments page. JJA/AGL designationsIn the November 2025 revision of the Japanese JJA/AGL Definitions and Nomenclature of Gemstones and Ornamental Materials, under Sapphire the species is corundum, the colour is orange-pink to pink-orange, and the treatment listed is diffusion heating (diffusion treatment); the original does not name beryllium-diffused sapphire, and it says diffusion heating without specifying the diffusing element; stones treated by diffusion heating must not use the alternative name Padparadscha. How to read the JJA/AGL table is explained on the treatments page.
GB/T 16552-2017, Annex B, Table B.1
Under the “Sapphire” row of Table B.1: Heating Optimization; Dyeing Treatment; Filling Graded — see §5.4.1, Table 1; Diffusion Treatment; Irradiation Treatment. The full row, with the effect column, is on the Sapphire page.
What Table B.1 is, and how the “see 5.4.1” grades are defined: see the GB/T 16552: optimization vs treatment page.
JJA/AGL (Japan) table of principal gem names, 2025
This table scrolls sideways on narrow screens.
| Gem name | Species | Colour | Listed in the table | Notes |
|---|---|---|---|---|
| Sapphire | Corundum | orangy pink to pinkish orange | diffusion heat treatment (Diffusion-treated) | listed under “Sapphire” in the table; this page is related (the source does not name it); the source says “diffusion heat treatment” without naming the element; the name padparadscha may not be used for diffusion-heated stones |
JJA/AGL definitions and nomenclature (2025 revision), table of principal gem names, p.12
How to read the JJA/AGL table: see the Gem treatments page.
What it is and how it's identified
Identification leads for Beryllium-Diffused Sapphire are registered for the diffusion-treated state, and this site notes that the cited GB/T 16553—2017 serves only as a reference and does not directly govern it; some leads take values for sapphire as a whole (regardless of colour and origin) rather than separate measurements. For diffusion-treated Beryllium-Diffused Sapphire: magnification shows surface microcrystallisation and recrystallised zircon inclusions; under immersion or diffused-light magnification, colour concentration is mostly not obvious; compositional instruments (such as LA-ICP-MS) detect anomalous levels of beryllium and other diffused elements in the surface layer, decreasing gradually from surface to interior. Values for sapphire as a whole: magnification shows colour concentration in fractures or cavities; under immersion or diffused light, colour concentrates along facet edges, the girdle or fractures in a network pattern, though this is mostly not obvious in Beryllium-Diffused Sapphire; some diffusion-treated blue sapphires fluoresce bluish white or bluish green under short-wave UV, and some diffusion-treated blue sapphires lack the 450nm absorption band; cobalt diffusion shows the characteristic cobalt absorption bands.
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”.
Items below that name the class they cover give the cited clause’s value for that whole class, not a measurement of Beryllium-Diffused Sapphire (how to read class-level values).
Care
The item-by-item care advice that the GIA Care and Cleaning Guide gives for the whole class, and so for Beryllium-Diffused Sapphire, is set out in full under care on the Sapphire entry.
How far testing can go
The CIBJO laboratory protocol covers Beryllium-Diffused Sapphire under “Sapphire” (§6.1.69): see identification on the Sapphire entry; the required tests are listed on the CIBJO laboratory protocol table for Sapphire.
Beryllium-Diffused Sapphire that has undergone diffusion treatment can be identified by the following features: Magnification shows color concentrated in fissures and hollows.
By diffused element: diffusion-treated star sapphire has thin, straight star rays and a surface layer flecked with white points; beryllium-diffused sapphire shows surface microcrystallization and recrystallization of its zircon inclusions; cobalt-diffused sapphire shows light blue spots on the surface.
Viewed under magnification in immersion or in scattered light, the color concentrates along edges, the girdle or fissures in a net-like pattern, though on beryllium-diffused sapphire this is mostly indistinct. As to fluorescence, some diffusion-treated blue sapphires may glow blue-white or blue-green under short-wave ultraviolet light.
As to absorption, some diffusion-treated blue sapphires lack the 450 nm absorption band, while cobalt-diffused sapphire shows the characteristic absorption bands of cobalt. Compositional analysis (LA-ICP-MS and the like) can detect an abnormal content of the diffused element — beryllium, for instance — in the surface layer, the concentration falling from the surface inwards.
GB/T 16553—2017
- Treatment state
- treated
- Does this standard apply
- can be followed as a reference only
- What this covers
- sapphire as a whole (all colours and origins)
- Treatment
- diffusion treatment
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.3 (diffusion treatment) (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
Beryllium-Diffused Sapphire that has undergone diffusion treatment can be identified by the following features: Under magnification the surface shows microcrystallisation and zircon inclusions show recrystallisation; under immersion or scattered light, colour concentration is mostly not obvious; composition analysis (e.g. LA-ICP-MS) shows an abnormal content of diffused elements such as beryllium in the surface layer, decreasing inwards.
GB/T 16553—2017
- Treatment state
- treated
- Does this standard apply
- can be followed as a reference only
- Treatment
- diffusion treatment
Source & check 2026-09-26
- Source
- GB/T 16553—2017 Gems — Testing (GB/T): §5.1.3 (diffusion) (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
How lab reports word it
Report wording for Beryllium-Diffused Sapphire is set out under report wording on the Corundum entry.
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).
- LMHC – Laboratory Manual Harmonisation Committee. Information Sheets.
- Federal Trade Commission (United States). In the Loupe: Advertising Diamond, Gemstones and Pearls.
- 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 Corundum on this site: 18 entries listed by this site's parent-entry links; synthetic, treated and similar entries carry their recorded state after the name; this page (Beryllium-Diffused Sapphire) is marked.
- Corundum
Sub-entries (13)
- Colour-change Sapphire
- Green Sapphire
- Orange Sapphire
- Padparadscha Sapphire
- Pink Sapphire
- Purple Sapphire
- Ruby
Sub-entries (2)
- Lead-Glass-Filled Ruby
- Synthetic Ruby (Synthetic product)
- Sapphire
Sub-entries (2)
- Beryllium-Diffused Sapphire
- Synthetic Sapphire (Synthetic product)
- Star Ruby
- Star Sapphire
- Synthetic Corundum (Synthetic product)
- White Sapphire
- Yellow Sapphire
This table scrolls sideways on narrow screens.
| Page | Content | Status |
|---|---|---|
| Browsing family | Oxide minerals | Live |
| Treatments recorded for this material | Heated / Heat-treated (via parent material), Dyed (via parent material), Filled / Fracture-filled (via parent material), Diffusion-treated, Irradiated (via parent material) | Live |
| Related articles | To be added (placeholder) | Planned |
Who maintains this page
The material facts in the Beryllium-Diffused Sapphire 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.