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Artificial products / Manufactured products · Artificial product type · Artificial material with no natural counterpart
Ruby-Glass Composite
A man-made composite material of Ruby fragments bonded with lead glass; it is not natural Ruby and must be named as a composite followed by the names of each component. 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 Ruby-Glass Composite forms and what gives its colourFormation setting, process and timescale, each finding graded and sourced
- How to identify Ruby-Glass CompositeIdentification points from the research literature
- Ruby-Glass Composite 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 Ruby-Glass CompositeThe listing name to use; what must be disclosed before sale
- Standard clauses that define Ruby-Glass CompositeWhich 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 ruby-glass composite is a manufactured composite gem material. It falls within CIBJO's definition of composite stones (5.18): artificial products made from two or more parts or layers that were previously separate and are joined by bonding or by other artificial means, their components being natural, artificial or both, provided at least one part is a gemstone. Among artificial products partly made by man, CIBJO lists 'ruby-glass composites' explicitly as an example of composite stones, alongside garnet-topped doublets and natural sapphire on synthetic ruby doublets. It is therefore no natural geological formation but a manufactured gem product, obtained by combining and cementing fragments or slices of natural ruby (corundum) with lead glass (artificially produced glass containing a high proportion of lead oxide); the cited sources say nothing about the specific assembly process, so the construction is taken from the standards/terminology definition and no process detail is invented from unverified sources.
Scope: Used to describe a composite gem product made by artificially combining and cementing natural ruby (corundum) with lead glass; emphasises its man-made assembled nature, which is not how natural ruby forms; the assembly process is based on standard / terminology definitions.
Sources CIBJO Gemstone Book 2022
Where it forms
Non-natural setting: the composite is assembled by hand during lapidary processing and does not occur in a geologic environment.
Sources CIBJO Gemstone Book 2022
The natural origin of its ruby component can be basalt-hosted or metamorphic (marble-hosted) corundum deposits (e.g. Myanmar, Mozambique, Thailand and others).
Sources CIBJO Gemstone Book 2022
How it forms, step by step
Natural ruby (corundum) fragments or slices are selected as the gem component (per the clause 5.18 composite-stone definition).
Sources CIBJO Gemstone Book 2022
Lead glass (artificially produced glass with a high lead oxide content, 5.50) is prepared as the bonding/combining medium.
Sources CIBJO Gemstone Book 2022
The ruby part and the lead glass are assembled into a complete gem by bonding or other artificial methods (per clause 5.18; the authoritative sources do not describe this process).
Sources CIBJO Gemstone Book 2022
Link to appearance
The finished appearance is governed by the color and clarity of the ruby fragments together with the distribution of lead glass; because it is assembled, overall transparency and color appearance are generally improved relative to the original fragments (the sources give no quantified figure).
Sources CIBJO Gemstone Book 2022
Timescale
The sources give no formation timescale for this composite; as a manufactured product it is assembled during processing and has no geologic age.
Sources CIBJO Gemstone Book 2022
Related base materials
- Ruby (red gem variety of corundum): part-of | The gem component of the composite is natural ruby (corundum)
- Lead glass (artificially produced glass with high lead oxide content): assembled-with | The ruby portion is artificially combined with lead glass, by bonding or similar methods, into a composite
Recorded localities
This is a manufactured, assembled or treated product that contains natural material. No locality is given for the finished product; see the parent material's entry for where the natural component is recorded.
How it is identified
Ruby–glass composite material is ruby with its fractures filled by glass, and its colour and appearance can resemble natural or other fracture-filled ruby, so unaided inspection cannot tell whether filling was applied. Recognition relies on laboratory testing: under the microscope and reflected light the filler shows a luster different from the host along with gas bubbles or blue flashes, X-ray imaging can reveal heavy-element concentrations within fractures, infrared spectroscopy can indicate glass filling, and energy-dispersive or mass spectrometry (EDXRF, LA-ICP-MS) can confirm the elements of the filler glass such as lead, bismuth, zinc, or silicon. The type and extent of filling must be determined by an accredited laboratory, and this entry provides no threshold usable for self-testing.
Evidence grade AScope: Safety boundary: appearance is insufficient to decide filling status; determination requires testing by an accredited laboratory, and this entry gives no self-test threshold.
Origin determination concerns natural material, whereas ruby-glass composite is an assembled composite stone (a manufactured composite), 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
A ruby-glass composite counts as a CIBJO composite stone—that is, an artificial product made from two or more parts or layers that were previously separate and are joined by bonding or by other artificial means, with at least one part having to be a gemstone.
Evidence grade AScope: A CIBJO terminology definition applying to its composite-stone category; it does not describe the specific assembly process.
Sources CIBJO Gemstone Book 2022
CIBJO explicitly lists 'ruby-glass composites' among the examples of artificial products partially made by man (composite stones), alongside garnet-topped doublets and natural sapphire on synthetic ruby doublets.
Evidence grade AScope: Concerns CIBJO's list of examples; the list is not exhaustive of all similar products.
Sources CIBJO Gemstone Book 2022
The composite's components include natural ruby (corundum) and lead glass, lead glass being artificially produced glass with a distinct high content of lead oxide.
Evidence grade AScope: The source names 'ruby-glass' in its example; the lead-glass clause 5.50 is a general definition and gives no specific proportions.
Sources CIBJO Gemstone Book 2022
The ruby-glass composite is not a naturally formed gemstone but an assembled artificial product (not an independent material).
Evidence grade AScope: Derived from CIBJO's definition of composite stones as parts assembled by artificial methods; a terminology-level conclusion.
Sources CIBJO Gemstone Book 2022
Limits of this research
- Research status: Formation, occurrence or other material-specific findings found in authoritative sources
- The assembly process is not described in the sources; the construction relies on the CIBJO terminology/definition.
- The natural origins of the ruby component are given only as possible examples and are not tied to a specific finished product.
- 'Ruby-glass composite' is a CIBJO example name; the sources give no specific proportions.
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
- Ruby-glass composite
CIBJO Gemstone Book 2022 5.50, 4.3.2.1 · LMHC Information Sheet #3 IS#3 “Corundum with/and glass (manufactured product)” Identification, IS#3 “Corundum with/and glass (manufactured product)” Further information, IS#3 “Corundum with glass filled fissures & cavities” Identification
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
"Ruby-Glass Composite" is a market name rather than a mineral species name; before using it, verify: Not a mineral: man-made or non-mineral material.
Evidence
- CIBJO · 5.50
What this means for you
Before buying, check the recommended listing name "Ruby-glass composite" 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
- Ruby-glass composite
VerifyNames, standards, technical facts, clauses and sources
Names
Recommended listing nameThe suggested listing name for Ruby-Glass Composite is Ruby-Glass Composite. Names in four languagesNames are registered in Simplified Chinese, Traditional Chinese, English (Ruby-Glass Composite) and Japanese; the Japanese name shown is the entry's own, and the wording used by the GSJ (Japan) for it is not yet verified by this site. Chinese standard nameFor the GB/T naming counterpart, the name itself is not listed in the standard, and the corresponding name is ruby (treated), under GB/T 16552—2017. Trade and mineralogical namesThe mineralogical name is paraphrased as a composite material made from ruby fragments and lead glass. Institution usageOn authority wording, the FTC text on file has no wording for this name (checked), and GIA, CIBJO and Gem-A are unchecked; the entry's own English name, Ruby-Glass Composite, does not represent the position of GIA, CIBJO or Gem-A.
- GSJ (Japan) formal name
- ルビー・ガラス複合材 (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)
- 红宝石（处理） (GB/T 16552—2017 §5.4.2.2 a))
- Mineralogical name
- Manufactured composite of ruby fragments and lead glass
Four-language names
- 简体中文
- 红宝石-玻璃复合材料
- 繁體中文
- 紅寶石-玻璃複合材料
- English
- Ruby-Glass Composite
- 日本語
- ルビー・ガラス複合材
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
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”.
Care
Normal care for every gemstone (CIBJO Gemstone Book §6.1), in brief:
- Handle it gently.
- Store pieces apart when not worn, so they cannot scratch each other.
- Clean with warm soapy water and a soft brush.
- Use ultrasonic cleaners only with caution.
The §6.1 wording and the full list of §6.2 special-care letters cited on this page are on the general gem care page.
Ruby-Glass Composite — care (chemicals): particularly susceptible to attack by acids, so keep it away from acids; glass, plastic or hardened-resin fillers in cavities or fractures can be scratched more readily than the stone around them, or be more easily damaged by heat or some acids (e.g. hydrofluoric); keep it away from all chemicals, heat and abrasives.
CIBJO Gemstone Book 2022
CIBJO Gemstone Book §6.2:special-care code h, special-care code l
- Treatment state
- treated
- Only after these treatments
- filling
Source & check 2026-09-26
- Source
- CIBJO Blue Book — Official Gemstone Book (Coloured Stone Commission 2022) (CIBJO): §8 Annex C, Ruby and glass, p.44; §6.2 h, l (locator checked 2026-09-26)
- Fact checked on
- 2026-09-26
How far testing can go
The CIBJO laboratory protocol covers Ruby-Glass Composite under “Ruby” (§6.1.68): see identification on the Ruby entry; the required tests are listed on the CIBJO laboratory protocol table for Ruby.
How lab reports word it
Report wording for Ruby-Glass Composite 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.
Clause-level definitions
Ruby-Glass Composite is registered in the clause-level definitions under the entry Ruby-Glass Composite, based on GB/T 16552—2017 Annex A, which defines it as an artificial composite made from ruby fragments and lead glass. The cross-check result for this clause is that GB/T lists it directly, and no CIBJO entry under the same standalone heading was found.
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| Term | Clause | Definition | Cross-check |
|---|---|---|---|
| Ruby-Glass Composite | GB/T 16552-2017 Annex A | Manufactured composite of ruby fragments and lead glass | 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.
- LMHC – Laboratory Manual Harmonisation Committee. Information Sheet #3: Corundum – with glass filled fissures & cavities; with/and glass (manufactured product), version 10, May 2025.
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.
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| 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 Ruby-Glass Composite 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.