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Natural inorganic gem materials · Mineral species · Natural identity; treatment status unknown

Uvarovite

A garnet-group mineral species with calcium and chromium end-members, often forming tiny crystal clusters; listed in Table A.1 of GB/T 16552—2017. 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.

Care and wear

What this page can answer

This page covers

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

Uvarovite is the Ca-Cr garnet species, the sixth garnet-group member after the five commercial species (pyrope, almandine, spessartine, grossular, andradite), and is green. Its crystals usually occur too small to cut, and it is sometimes set as clusters in jewellery. More than twenty garnet species are named; sharing essentially the same crystal structure but differing chemically, the members commonly form solid solutions. In chemical analyses uvarovite appears only as a minor end-member component (e.g. some pyrope-spessartine samples contain 0.11–0.19% uvarovite).

Scope: Used to describe uvarovite's position within the garnet group as a green end-member mineral species, its occurrence and solid solution; the source does not give independent formation temperatures, pressures or ages for it.

Sources GIA Garnet Description · G&G Spring 2017

Where it forms

Garnet-group crystallization setting: uvarovite, the Cr3+-dominant end member, crystallizes within the same systems as the other Al/Ca garnets.

Sources GIA Garnet Description

Typically fine-grained (crystals usually too small to cut), sometimes as clusters.

Sources GIA Garnet Description

How it forms, step by step

  1. In a suitable garnet-crystallizing system, Cr3+ occupies the aluminium site, forming the uvarovite end member.

    Sources GIA Garnet Description
  2. Uvarovite dissolves with other garnet species and usually appears only as a minor end-member component of solid solutions.

    Sources GIA Garnet Description · G&G Spring 2017
  3. In most cases the crystals are too small to cut and are only occasionally used as clusters in jewellery.

    Sources GIA Garnet Description

Link to appearance

Uvarovite is green; because its crystals are usually too small, it is rarely faceted and only occasionally set as clusters.

Sources GIA Garnet Description

Timescale

The sources state no absolute age or duration for garnet formation.

Sources GIA Garnet Description · G&G Spring 2017

Related base materials

  • Garnet group: mineral-group member | Uvarovite is the calcic end-member mineral species dominated by Ca2+ and Cr3+, and is the sixth member of the garnet group

Recorded localities

Authoritative sources list the localities below; the list is not exhaustive.

Locality sketch mapLand outlines only; the map does not depict any national or regional boundary. Dots mark approximate positions. Base map: Natural Earth (public domain).

Europe

These are localities recorded by authoritative sources, not an origin finding for any individual piece. The CIBJO Gemstone Book (2022, §4.2.3) says a place of origin names where a gem was mined or harvested, is a matter of opinion, does not imply a level of quality, and that cutting, processing or exporting centres must not be used to imply origin. See how far testing can go on this page, the origin determination guide and the overview of recorded localities.

Other research findings

Uvarovite is the sixth garnet-group member (after the five commercial species) and is green.

Evidence grade A

Scope: Places it within the group and notes its colour; not a commercial faceting species.

Sources GIA Garnet Description

Uvarovite crystals usually occur too small to cut and are sometimes set as clusters in jewellery.

Evidence grade A

Scope: Describes its typical habit and use; larger crystals are not excluded.

Sources GIA Garnet Description

More than twenty garnet species are named but only five are commercially important; uvarovite is the additional sixth member.

Evidence grade A

Scope: Distinguishes commercial from non-commercial group members.

Sources GIA Garnet Description

In chemical analyses uvarovite appears only as a minor end-member component of solid solutions (e.g. some pyrope-spessartine contains 0.11–0.19% uvarovite).

Evidence grade A

Scope: End-member calculation for a few colour-change samples; not uvarovite as a major phase.

Sources G&G Spring 2017

Limits of this research

  • Research status: Only partial material-specific findings found; gaps are stated as gaps
  • No absolute age, P-T or deposit data for uvarovite as an independent phase.
  • Colour (chromium) and end-member chemistry rest on a general GIA entry and sample end-member calculations only.

Methodology

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
Uvarovite

GB/T 16552—2017 Table A.1 “Uvarovite” · IMA Mineral List 2026-07 “Uvarovite”

Construction or treatment status

Natural identity; treatment status unknown

Treatments recorded for this material: Heated / Heat-treated (via parent material), Filled / Fracture-filled (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

Uvarovite is Uvarovite garnet; use "Uvarovite" for listings, and disclose any known treatments.

Evidence

  • GB/T · Table A.1, row 钙铬榴石 (Uvarovite)

What this means for you

Before buying, check the recommended listing name "Uvarovite" and any disclosed treatments on this page, and ask the seller for a grading report if in doubt.

Known uncertainty

Last reviewed
2026-09-01

Care and wear

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.

The item-by-item care advice that the GIA Care and Cleaning Guide gives for the whole class, and so for Uvarovite, is set out in full under care on the Garnet entry.

Care

Uvarovite — care (heat): Some stones are prone to damage due to thermal shock. Do not expose them to extreme temperature changes.

CIBJO Gemstone Book 2022

CIBJO Gemstone Book §6.2:special-care code e

Treatment state
any treatment state
Source & check 2026-09-25
Source
Fact checked on
2026-09-25

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.

QuestionMatching entries
Heat and thermal shockcare (heat)

Treatments and identification leads

One row per treatment, with three standards side by side: how often it occurs and how stable it is (CIBJO), its category in GB/T 16552—2017 Table B.1 (this site's paraphrase) and how the JJA/AGL 2025 table lists it. Each CIBJO value links to its entry under “Testing and market”, where the wording and source are given in full.

This table scrolls sideways on narrow screens.

TreatmentMarket frequency (CIBJO)Stability (CIBJO)GB/T 16552 categoryJJA/AGL listingIdentification leads
Heating——Optimization——
Filling——Graded — see §5.4.1, Table 1——

“—” means the cited source gives no value for that item, not “none”. Source: GB/T 16552—2017 Table B.1 (row for Garnet)

Whether a treatment has to show in the name differs between the two rule sets (this site’s paraphrase):

  • GB/T 16552—2017: a method classed as treatment has to be stated in the name itself — the method put before the name, or added in brackets after it; a method classed as optimization does not need to appear in the name, though one marked “Optimization (annotation required)” still has to be noted in the quality documents. Source: §5.4.2.1 a), b); §5.4.2.2 a)
  • CIBJO Gemstone Book 2022: no longer splits treatments into ones that need specific disclosure and ones that need only general disclosure: every treatment is to be disclosed, and the seller tells the buyer which treatment was used and what special care it calls for. Source: §4.2.5 Note 2, §4.2.5.1, pp.14–15

What this table covers

What this page can give

  • Registered treatments, their stability and how often they occur (see the table above)
  • Identification leads for each treatment, for use when sending a stone for testing

VerifyNames, standards, technical facts, clauses and sources

Names

Standard and listing namesThe Chinese formal name for Uvarovite is the Chinese name for uvarovite, from GB/T 16552—2017 Table A.1, and the suggested listing name is Uvarovite. Trade and mineralogical namesThe mineralogical name is written as Uvarovite garnet. Names in four languagesThe four-language names are the Simplified Chinese, Traditional Chinese and Japanese names together with the English name Uvarovite; the GSJ (Japan) formal name is the Japanese name shown on the page. Institution usageOn authority wording, CIBJO has Uvarovite on record (CIBJO Gemmological Laboratories Book 2024), the FTC text has no wording for this name (checked), and GIA and Gem-A are unchecked; bodies without a recorded wording show the entry's own English name, which does not represent their position.

Authority wording

GIA, FTC, CIBJO, Gem-A
Uvarovite (on record for CIBJO (CIBJO Gemmological Laboratories Book 2024); no wording for this name in the FTC text on file; GIA, Gem-A unchecked — bodies without a recorded wording show the entry's own English name)
GSJ (Japan) formal name
灰クロムザクロ石
Chinese formal name
钙铬榴石 (GB/T 16552—2017 Table A.1)
Mineralogical name
Uvarovite garnet

Four-language names

简体中文
钙铬榴石
繁體中文
鈣鉻榴石
English
Uvarovite
日本語
ウバロバイト/灰クロム柘榴石

See also: Misleading and prohibited trade names · Supplementary name index

Classification

Origin
Natural materials
Material domain
Natural inorganic gem materials
Browsing family
Garnet-group minerals and gem varieties
Identity tier
Mineral species
Mineral chemical class
Silicates
Construction or treatment status
Natural identity; treatment status unknown

Treatments listed by standards

For Uvarovite, the “Garnet” row of GB/T 16552—2017 Annex B, Table B.1 is applied: heating, classed as optimization; filling, defined by grades. This is this site's application to Uvarovite; Table B.1 of GB/T 16552—2017 itself does not register Uvarovite. The full row including the effect column is on the Garnet entry, and what Table B.1 notes and how the filling grades are defined are explained on the Gem treatments page.

GB/T 16552-2017, Annex B, Table B.1

Under the “Garnet” row of Table B.1: Heating Optimization; Filling Graded — see §5.4.1, Table 1. The full row, with the effect column, is on the Garnet page.

What Table B.1 is, and how the “see 5.4.1” grades are defined: see the GB/T 16552: optimization vs treatment page.

What it is and how it's identified

Registered material facts for Uvarovite: the composition (phase) is uvarovite (garnet group). Under the clauses for garnet as a whole mineral group, it is crystalline and cubic, with a crystal habit of rhombic dodecahedra or trapezohedra, or combinations of the two; Mohs hardness 7–8, no cleavage; optically isotropic, commonly with anomalous extinction, no birefringence. Under the clauses for garnet as a whole mineral group, density is 3.5–4.3 g/cm³, the clause also having finer sub-ranges, with the overall value taken; the uvarovite clause gives 3.75 with an allowed deviation of ±0.03, from which 3.72–3.78 g/cm³ is derived. The refractive index is 1.82–1.88, the cited clause giving 1.850 with an allowed deviation of ±0.030, from which the limits are derived. Transparency is translucent to opaque. When untreated, the body colour is green. Under the clauses for garnet as a whole mineral group, when untreated there is no pleochroism and the lustre is vitreous to subadamantine; under the same clauses, a star effect may be seen but is rare, generally four-rayed, occasionally six-rayed (almandine), and a colour-change effect may be seen.

Registered material facts

Each row carries its own source and check date and can be cited on its own; “—” means the cited source gives no value, not “none”.

Chemical composition, luminescence, UV-visible spectrum, infrared spectrum, magnification: these whole-class features are given in the cited clause for garnet (the whole mineral group), so they are not repeated on the Uvarovite page; see the material facts on the Garnet entry.

Items below that name the class they cover give the cited clause’s value for that whole class, not a measurement of Uvarovite (how to read class-level values).

Definition

Uvarovite — nomenclature status: IMA status A: approved (accepted by the IMA after it was set up in 1958).

CIBJO Gemmological Laboratories Book 2024

Source & check 2026-09-22
Source
Fact checked on
2026-09-22

Uvarovite — composition (phase): uvarovite (garnet group)

CIBJO Gemmological Laboratories Book 2024

Source & check 2026-09-22
Source
Fact checked on
2026-09-22

Structure

Uvarovite — structure (overall): crystalline

GB/T 16553—2017

Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Uvarovite — structure (crystal system): cubic

GB/T 16553—2017

Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Uvarovite — structure (crystal habit): rhombic dodecahedra, tetragonal trisoctahedra, or crystals combining the two forms.

GB/T 16553—2017

Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Durability

Uvarovite — Mohs hardness: 7–8

GB/T 16553—2017

123456789107–8References (diamond = value, bar = range; below)

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))

Mohs hardnessSource: GB/T 16553—2017
Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Uvarovite — cleavage: none

GB/T 16553—2017

Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Physical properties

Uvarovite — density: 3.5–4.3 g/cm³

GB/T 16553—2017

0.51.52.53.54.55.56.57.53.5–4.3
Specific gravitySource: GB/T 16553—2017
Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
General note
the clause has finer ranges
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Uvarovite — density: 3.72–3.78 g/cm³

GB/T 16553—2017

0.51.52.53.54.55.56.57.53.72–3.78
Specific gravitySource: GB/T 16553—2017
Does this standard apply
applies to this entry
Qualification

The clause we cite gives 3.75, with a stated tolerance of ±0.03. The range shown here is worked out from that.

Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 Density · Uvarovite (locator checked 2026-09-28)
Fact checked on
2026-09-26

Optical

Optical effects on record: asterismrepresentative example: cause in Star Sapphire (schematic)colour change

Uvarovite — optic character: isotropic, commonly with anomalous extinction

GB/T 16553—2017

Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Uvarovite — refractive index: 1.82–1.88

GB/T 16553—2017

1.31.72.12.52.93.31.82–1.88
Refractive indexSource: GB/T 16553—2017
Does this standard apply
applies to this entry
Qualification

The clause we cite gives 1.850, with a stated tolerance of ±0.030. The range shown here is worked out from that.

Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 Refractive index · Uvarovite (locator checked 2026-09-28)
Fact checked on
2026-09-26

Uvarovite — birefringence: none

GB/T 16553—2017

Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Uvarovite — transparency: translucent to opaque.

CIBJO Gemmological Laboratories Book 2024

Source & check 2026-09-22
Source
Fact checked on
2026-09-22

Uvarovite — pleochroism: none

GB/T 16553—2017

Treatment state
untreated
Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Uvarovite — spectrum (UV-visible): unknown

GB/T 16553—2017

Does this standard apply
applies to this entry
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 UV-visible spectrum (locator checked 2026-09-28)
Fact checked on
2026-09-26

Uvarovite — optical effect (asterism): seen; rare; generally a four-pointed star; occasionally a six-rayed star (almandine).

GB/T 16553—2017

Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Uvarovite — optical effect (colour change): seen

GB/T 16553—2017

Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

body colour2 sources compared

Uvarovite — body colour: green.

CIBJO Gemmological Laboratories Book 2024

Treatment state
untreated
Qualification

In chapter 7 of the CIBJO Gemmological Laboratories Book, the colour descriptions of Aventurine Quartz, Diopside, Emerald and other entries also name green or a greenish colour.

General note
colour alone is not identity
Source & check 2026-09-22
Source
Fact checked on
2026-09-22

Uvarovite — body colour: green

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 Aquamarine, Dioptase, Malachite and other variety clauses also name green or a greenish colour.

General note
colour alone is not identity
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 Colour · Uvarovite (locator checked 2026-09-28)
Fact checked on
2026-09-26

How the sources relate

CIBJO Gemmological Laboratories Book 2024 and GB/T 16553—2017

consistent

The two entries give the same colours in matching words. Both say green.

CIBJO definitions
asterism, colour change

Quality factors

Uvarovite — quality factor (lustre): vitreous to subadamantine

GB/T 16553—2017

Treatment state
untreated
Does this standard apply
applies to this entry
What this covers
garnet (the whole mineral group)
Source & check 2026-09-26
Source
  • GB/T 16553—2017 Gems — Testing (GB/T): §5.1.15 (locator checked 2026-09-26)
Fact checked on
2026-09-26

Each row's “Source & check” expands to the full source; the date beside it is the fact check date.

1.81.851.93.73.83.944.1Refractive indexSpecific gravity12345Uvarovite

This material (RI / SG midpoints): 1.85 / 3.9; Closest values: 1Andradite 1.875 / 3.9, 2Garnet 1.825 / 3.9, 3Demantoid 1.89 / 3.84, 4Spessartine 1.802 / 3.9, 5Almandine 1.79 / 3.9

Show the full chart (330 registered materials)1.41.51.61.71.81.922.12.22.32.41234567Refractive indexSpecific gravity12345Uvarovite

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

Refractive index × specific gravity (all registered materials)Each dot is one material's registered refractive index and specific gravity (range midpoints, not measurements); gold = this material, dark = the nearest few (picked on this site by distance in RI ÷ 0.02 and SG ÷ 0.1, leaving out near-identical varieties of the same species)Source: each material's registered refractive index and specific gravity facts (GB/T 16553 and others; sources on each entry)

Testing and market

Uvarovite falls under the Garnet line of the CIBJO laboratory protocol; its identification is in the identification section of the Garnet entry, and the list of required methods is on the laboratory testing page. On how far testing can go, the Uvarovite row in Appendix C of the CIBJO Blue Book (Official Gemstone Book, 2022) concludes that no synthetic counterpart of Uvarovite is available on the market.

The CIBJO laboratory protocol covers Uvarovite under “Garnet” (§6.1.38): see identification on the Garnet entry; the required tests are listed on the CIBJO laboratory protocol table for Garnet.

How far testing can go

Uvarovite — synthetic counterpart on the market: No synthetic counterpart of this material is commercially available

CIBJO Gemstone Book 2022

Treatment state
any treatment state
Source & check 2026-09-22
Source
Fact checked on
2026-09-22

Each row's “Source & check” expands to the full source; the date beside it is the fact check date.

Clause-level definitions

Uvarovite is defined directly in CIBJO Gemmological Laboratories Book 2024, listed under the name Uvarovite, with the definition green, translucent to opaque; the cross-check result is that it is defined directly by CIBJO, and Uvarovite also appears in the GB/T annex. Uvarovite is also listed as Uvarovite in the IMA Mineral List entry, with the chemical formula Ca3Cr2(SiO4)3, cross-checked against the RRUFF/IMA master mineral list; this is public domain data.

This table scrolls sideways on narrow screens.

TermClauseDefinitionCross-check
Uvarovite7.2.1.253green, translucent to opaqueDefined directly by CIBJO; also present in the GB/T annex.
UvaroviteIMA Mineral List entryUvarovite Ca3Cr2(SiO4)3 A 1967 s.p.Cross-checked against the RRUFF/IMA master mineral list (public domain data).

Evidence and sources

Authority basis and clause sources

GB/T 16552—2017
Listed Table A.1 “Uvarovite” · Source
IMA Mineral List 2026-07
Listed “Uvarovite” · Source
CIBJO Gemmological Laboratories Book 2024
Listed §7.2.1.253 “Uvarovite” · Source

Sources

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.

PageContentStatus
Browsing familyGarnet-group minerals and gem varietiesLive
Treatments recorded for this materialHeated / Heat-treated (via parent material), Filled / Fracture-filled (via parent material)Live
Related articlesTo be added (placeholder)Planned

Who maintains this page

The material facts in the Uvarovite 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.

Facts editor
June
Reviewer
Ralph
How facts are checked
Each fact is matched to the clause it cites; facts checked between 2026-09-22 and 2026-09-26
Last revised
2026-10-12
Purpose
Lets buyers and sellers check naming, disclosure and material facts clause by clause.

Spotted an error? Report it on the forum