Meaning before convenience
Terms remain distinct where scientific, gemological, market, or legal precision depends on the distinction.
Related words are not automatically interchangeable.
The English edition uses a controlled vocabulary across The Book, Handbook, Buyer’s Guide, and Learn. The English glossary contains 406 entries across 23 categories and the terminology registry contains 34 canonical usage rules.
Technical meaning before literal translation
Internationally established terms are retained where translation would blur laboratory, scientific, or trade meaning.
No false synonyms
Shape, cutting style, and cut quality; provenance, traceability, and chain of custody; fire and dispersion are related concepts, not interchangeable labels.
Currentness matters
Regulatory, laboratory, and trade nomenclature can change and must be monitored according to source scope and date.
FORM RULE IN THE CROATIAN EDITION
How the Croatian edition chooses between Croatian and international terms
- Official Croatian term. Where a term exists in Croatian legislation, in the Croatian title of an HRN standard or in the Croatian Encyclopaedia, it is used. Example: neobrađeni dijamant for rough diamond (Regulation on the control of import and export of rough diamonds, NN 97/2003; Croatia).
- International term in italics. Where no official Croatian term was found, the international technical term is kept in italics with a Croatian explanation, for example girdle; Croatian adds the case ending directly to the foreign word without a hyphen (girdlea, girdleu), following Hrvatski pravopis.
- Grades and trade names as printed. Laboratory grades, report field names, trade names and proper names stay in English as the source prints them, for example Excellent, Fancy Vivid or the Treatment field.
Foreign words are set in italics (IHJJ Hrvatski pravopis, 1st online edition (2013), https://pravopis.hr, 6.1 and 6.3; Croatia). At the first mention in each chapter a term receives a short explanation and a link to the glossary. This English edition links the first mention of each glossary term in a chapter in the same way.
Our own rule. The orthography does not cover every case. For those cases our own rule applies, not a rule of the orthography: English plurals, words with a silent -e and multi-word expressions are set in italics as the whole word or the whole expression as written, and the Croatian ending is attached directly to them, as in rule 6.1.
A living book. Some terms await alignment with HRN EN ISO 24016:2026 and HRN EN ISO 18323:2015 (Croatia). HZN adopted both in the original English text; only the title is in Croatian. If a Croatian text is published, the terms will be aligned with it and the change will be shown on the currentness page.
Terms that stay in English in the Croatian edition (133)
TermReason
A Diamond Is ForeverGrade, trade name or proper name as printed by the laboratory or source.
Accent stoneInternational term: no official Croatian term was found.
Acquisition edgeInternational term: no official Croatian term was found.
ASETGrade, trade name or proper name as printed by the laboratory or source.
As-grownInternational term: no official Croatian term was found.
Bezel settingInternational term: no official Croatian term was found.
Bid-ask spreadInternational term: no official Croatian term was found.
BlockchainGrade, trade name or proper name as printed by the laboratory or source.
BlockingGrade, trade name or proper name as printed by the laboratory or source.
Bow-tie effectGrade, trade name or proper name as printed by the laboratory or source.
Branded cutsInternational term: no official Croatian term was found.
Brightfield illuminationInternational term: no official Croatian term was found.
BrillianceInternational term: no official Croatian term was found.
BrillianteeringGrade, trade name or proper name as printed by the laboratory or source.
BrutingGrade, trade name or proper name as printed by the laboratory or source.
Burn markInternational term: no official Croatian term was found.
Buyback policyInternational term: no official Croatian term was found.
Buyer BriefInternational term: no official Croatian term was found.
Canary diamondGrade, trade name or proper name as printed by the laboratory or source.
Canonical textInternational term: no official Croatian term was found.
Chameleon diamondGrade, trade name or proper name as printed by the laboratory or source.
Chameleon diamondGrade, trade name or proper name as printed by the laboratory or source.
Champagne diamondGrade, trade name or proper name as printed by the laboratory or source.
Channel settingInternational term: no official Croatian term was found.
Clarity gradeGrade, trade name or proper name as printed by the laboratory or source. Awaiting HRN EN ISO 24016:2026 (Croatia).
Clarity plotInternational term: no official Croatian term was found.
Cognac diamondGrade, trade name or proper name as printed by the laboratory or source.
Color gradeGrade, trade name or proper name as printed by the laboratory or source. Awaiting HRN EN ISO 24016:2026 (Croatia).
Color centerInternational term: no official Croatian term was found.
Comparable saleInternational term: no official Croatian term was found.
CrownInternational term: no official Croatian term was found. Awaiting HRN EN ISO 24016:2026 (Croatia).
Crystal inclusionGrade, trade name or proper name as printed by the laboratory or source.
CuletInternational term: no official Croatian term was found. Awaiting HRN EN ISO 24016:2026 (Croatia).
Cushion shapeGrade, trade name or proper name as printed by the laboratory or source.
Cut gradeGrade, trade name or proper name as printed by the laboratory or source. Awaiting HRN EN ISO 24016:2026 (Croatia).
Darkfield illuminationInternational term: no official Croatian term was found.
De BeersGrade, trade name or proper name as printed by the laboratory or source.
Depth percentageGrade, trade name or proper name as printed by the laboratory or source.
Diamond bourseInternational term: no official Croatian term was found.
Diamond seedInternational term: no official Croatian term was found.
Diamond sightInternational term: no official Croatian term was found.
Diamond tenderInternational term: no official Croatian term was found.
Diamond-like appearanceInternational term: no official Croatian term was found.
Digital forgeryInternational term: no official Croatian term was found.
Due diligenceInternational term: no official Croatian term was found.
Emerald cutGrade, trade name or proper name as printed by the laboratory or source.
Entity sanctionInternational term: no official Croatian term was found.
Ethical claimInternational term: no official Croatian term was found.
Evidence snapshotInternational term: no official Croatian term was found.
ExtinctionInternational term: no official Croatian term was found.
Eye-cleanInternational term: no official Croatian term was found.
Face-upInternational term: no official Croatian term was found.
Face-up sizeInternational term: no official Croatian term was found. Awaiting HRN EN ISO 24016:2026 (Croatia).
Facet junctionInternational term: no official Croatian term was found.
FancyGrade, trade name or proper name as printed by the laboratory or source.
Fancy DarkGrade, trade name or proper name as printed by the laboratory or source.
Fancy DeepGrade, trade name or proper name as printed by the laboratory or source.
Fancy IntenseGrade, trade name or proper name as printed by the laboratory or source.
Fancy LightGrade, trade name or proper name as printed by the laboratory or source.
Fancy redGrade, trade name or proper name as printed by the laboratory or source.
Fancy shapeGrade, trade name or proper name as printed by the laboratory or source.
Fancy VividGrade, trade name or proper name as printed by the laboratory or source.
Fancy-color diamondGrade, trade name or proper name as printed by the laboratory or source.
FeatherGrade, trade name or proper name as printed by the laboratory or source. Awaiting HRN EN ISO 24016:2026 (Croatia).
FlawlessGrade, trade name or proper name as printed by the laboratory or source.
GirdleInternational term: no official Croatian term was found. Awaiting HRN EN ISO 24016:2026 (Croatia).
GolcondaGrade, trade name or proper name as printed by the laboratory or source.
GrainingInternational term: no official Croatian term was found. Awaiting HRN EN ISO 24016:2026 (Croatia).
Halo setting/designInternational term: no official Croatian term was found.
Hammer priceInternational term: no official Croatian term was found.
Heart shapeGrade, trade name or proper name as printed by the laboratory or source.
Hearts and arrowsGrade, trade name or proper name as printed by the laboratory or source.
IncludedGrade, trade name or proper name as printed by the laboratory or source.
Indented naturalGrade, trade name or proper name as printed by the laboratory or source. Awaiting HRN EN ISO 24016:2026 (Croatia).
Insurance replacement valueInternational term: no official Croatian term was found.
Internal grainingInternational term: no official Croatian term was found. Awaiting HRN EN ISO 24016:2026 (Croatia).
Internally FlawlessGrade, trade name or proper name as printed by the laboratory or source.
Investment thesisInternational term: no official Croatian term was found.
Keel lineInternational term: no official Croatian term was found.
Light returnInternational term: no official Croatian term was found.
Lizard skinInternational term: no official Croatian term was found.
Loose stoneInternational term: no official Croatian term was found.
Luminescence imagingInternational term: no official Croatian term was found.
LusterInternational term: no official Croatian term was found.
MacleInternational term: no official Croatian term was found.
Master stoneInternational term: no official Croatian term was found.
Material identityInternational term: no official Croatian term was found.
MeleeGrade, trade name or proper name as printed by the laboratory or source.
MoissaniteInternational term: no official Croatian term was found.
Mounted stoneInternational term: no official Croatian term was found.
NaturalGrade, trade name or proper name as printed by the laboratory or source. Awaiting HRN EN ISO 24016:2026 (Croatia).
Old European cutGrade, trade name or proper name as printed by the laboratory or source.
Old Mine cutGrade, trade name or proper name as printed by the laboratory or source.
PassGrade, trade name or proper name as printed by the laboratory or source.
Pavé settingInternational term: no official Croatian term was found.
PavilionInternational term: no official Croatian term was found. Awaiting HRN EN ISO 24016:2026 (Croatia).
Pear shapeGrade, trade name or proper name as printed by the laboratory or source.
PolishGrade, trade name or proper name as printed by the laboratory or source. Awaiting HRN EN ISO 24016:2026 (Croatia).
Polish gradeGrade, trade name or proper name as printed by the laboratory or source. Awaiting HRN EN ISO 24016:2026 (Croatia).
Polish linesInternational term: no official Croatian term was found.
Polished yieldInternational term: no official Croatian term was found.
Primary sourceInternational term: no official Croatian term was found.
Princess cutGrade, trade name or proper name as printed by the laboratory or source.
Prong settingInternational term: no official Croatian term was found.
Radiant cutGrade, trade name or proper name as printed by the laboratory or source.
ReferGrade, trade name or proper name as printed by the laboratory or source.
Report commentsGrade, trade name or proper name as printed by the laboratory or source.
Report fraudInternational term: no official Croatian term was found.
Report verificationInternational term: no official Croatian term was found.
Resale valueInternational term: no official Croatian term was found.
Responsible sourcingInternational term: no official Croatian term was found.
Retail priceInternational term: no official Croatian term was found.
Ring headInternational term: no official Croatian term was found.
Ring shankInternational term: no official Croatian term was found.
Ring shoulderInternational term: no official Croatian term was found.
Secondary sourceInternational term: no official Croatian term was found.
Seller net proceedsInternational term: no official Croatian term was found.
SightholderGrade, trade name or proper name as printed by the laboratory or source.
Single cutGrade, trade name or proper name as printed by the laboratory or source.
SparkleInternational term: no official Croatian term was found.
Surface grainingInternational term: no official Croatian term was found. Awaiting HRN EN ISO 24016:2026 (Croatia).
Sustainability claimInternational term: no official Croatian term was found.
SymmetryGrade, trade name or proper name as printed by the laboratory or source. Awaiting HRN EN ISO 24016:2026 (Croatia).
Symmetry gradeGrade, trade name or proper name as printed by the laboratory or source. Awaiting HRN EN ISO 24016:2026 (Croatia).
System boundaryInternational term: no official Croatian term was found.
Table facetInternational term: no official Croatian term was found. Awaiting HRN EN ISO 24016:2026 (Croatia).
Table percentageInternational term: no official Croatian term was found. Awaiting HRN EN ISO 24016:2026 (Croatia).
Temperature gradientInternational term: no official Croatian term was found.
Thermal conductivity testerInternational term: no official Croatian term was found.
Three-stone ringInternational term: no official Croatian term was found.
Triple ExcellentGrade, trade name or proper name as printed by the laboratory or source.
Wholesale priceInternational term: no official Croatian term was found.
WindowingInternational term: no official Croatian term was found.
CANONICAL RULES
34 English usage rules
Diamond is not the same as brilliant cut
Diamond describes the material or natural mineral category according to context; brilliant describes a cutting style. Do not use brilliant as a generic synonym for diamond.
Shape, cutting style, and cut quality are three different axes
Shape describes the outline; cutting style or facet arrangement describes the organization of facets; cut quality evaluates execution and/or optical outcome within a specific system.
Carat and gold karat are not the same unit
Carat (ct) is gemstone mass, equal to 0.2 g. Gold karat (K/kt) describes the fineness of a gold alloy.
A synthetic diamond is not a simulant
A synthetic (laboratory-grown) diamond is diamond material of technological origin. Moissanite and cubic zirconia are simulants because they are not diamond material.
Growth method and treatment must remain separate
CVD or HPHT can describe a growth method; HPHT can also be a post-growth treatment. CVD-grown + HPHT-treated does not mean HPHT-grown.
Natural and untreated are not synonyms
A natural diamond can be treated. Material origin and treatment history are separate pieces of information.
Always qualify origin
Origin can mean origin of color, geographic or mining origin, customs origin, or a broader provenance claim. In technical writing, state which meaning is intended.
Provenance, traceability, and chain of custody are not synonyms
Provenance is documented history or origin; traceability is the ability to track; chain of custody is the sequence of control or transfer. One does not automatically prove another.
Screening is not identification
A pass/refer screening result is valid only within the validated scope. Refer is not a diagnosis, and pass is not confirmation of every property of the stone.
A diamond tester is not an origin tester
A thermal or combined handheld tester can assist with material identity, but it should not be described as standalone evidence of natural versus synthetic origin.
A grading report is not automatically a certificate
Use the name of the document the laboratory actually issues. Certificate as a generic synonym can create a misleading impression of a guarantee or certification.
A report is not the stone
Checking a document number confirms a record, not physical correspondence. Matching requires inscription, mass, dimensions, plotting, and/or microscopic characteristics.
Color grade and origin of color are not the same information
Color grade describes observed color within a system; origin of color reaches a conclusion about the natural or treated genesis of the color within the scope of the service.
Fancy shape and fancy color use the same word in different contexts
For shape, fancy means a non-round shape; in fancy-color grading it belongs to color and intensity nomenclature. The context must remain clear.
Fire and dispersion are not synonyms
Dispersion is the physical separation of wavelengths; fire is the perceived colored flash in a cut stone.
Brightness, brilliance, and sparkle should be distinguished
Brightness can be a defined appearance component; brilliance is a broader or historical term; sparkle is a more informal description of flashing.
A clarity characteristic is not automatically an inclusion
Clarity characteristics include inclusions and blemishes. An external characteristic is not necessarily an inclusion.
An inclusion name is not a clarity grade
Feather, cloud, crystal, or pinpoint describe a characteristic. A grade results from evaluating its overall effect according to the grading system.
Atomic type is not an origin test
Type IIa, IIb, or Ib can be diagnostically useful information, but an individual type by itself does not prove natural or synthetic origin.
Synthetic must clearly name the material
Synthetic diamond, synthetic moissanite, and synthetic sapphire are different materials. Synthetic on its own, without naming the material, can be ambiguous.
Fake diamond is not a professional material category
If the object is moissanite, CZ, a composite, or a report-related fraud, name that specific issue.
A trade name does not replace a laboratory description
Canary, champagne, cognac, chocolate, and similar trade terms should not replace a full laboratory color description.
A branded name does not become a generic term
Protected names, such as certain Asscher variants or commercial programs, should not be used as universal categories without the necessary rights and context.
Face-up size is not carat mass
Two stones of equal mass can have different face-up spread because of shape, depth, and proportions.
Retail price, value, and seller net are not the same
Asking price, an appraised type of value, and net proceeds on resale are different economic quantities.
Buyback is not guaranteed market liquidity
Buyback and upgrade programs are contractual policies of a specific seller, with conditions and a date.
An investment thesis is not a marketing label
A claim about investment potential should be tied to acquisition edge, rarity and demand thesis, holding period, exit market, costs, and downside.
KPCS compliance is not sanctions compliance
The Kimberley Process governs a defined segment of rough-diamond trade; sanctions compliance checks separate legal prohibitions and designated persons or entities.
Conflict-free is not a universal ethical claim
The formal conflict-diamond framework has a defined scope and does not automatically cover every human-rights, environmental, or sanctions risk.
Ethical, sustainable, and eco-friendly require methodology
Absolute value or environmental claims without system boundaries, indicators, and evidence are not sufficiently precise for technical writing.
Blockchain does not create truth from incorrect input
A distributed record can strengthen record integrity after entry, but it does not by itself prove that the original data about a stone was true.
An AI result requires a validated scope
AI-assisted matching or classification is valid only for the population and conditions for which the method was validated; it is not autonomous evidence.
Evidence closure and currentness are separate
A claim can be well supported at a particular evidence snapshot and still become outdated quickly.
A URL is not content identity
The HOK ID remains the stable identifier of an entity; a URL is an address that may change with a redirect.
AUTHORITIES AND SCOPE
What informs the terminology system
No source is presented as a universal authority outside its defined scope. The registry distinguishes canonical manuscript context, international nomenclature, grading frameworks, laboratory policy, and regulatory guidance.
Primary internal terminology and context source across 105 chapters.
Currentness: 2026-08-08International nomenclature and grading framework.
Currentness: MonitoredOfficial source ↗Consumer-facing distinction among diamond, laboratory-grown/synthetic diamond and simulants.
Currentness: MonitoredOfficial source ↗Disclosure and business terminology for laboratory-grown diamonds.
Currentness: MonitoredOfficial source ↗Permitted descriptors and definitions for diamond-industry consumer terminology.
Official source ↗Terminology, classification and test-method framework for its defined scope of natural, unmounted, polished diamonds over 0.25 ct; not a universal grading standard for every diamond category.
Official source ↗Widely used definitions for color, clarity, cut, carat and optical appearance terms.
Currentness: MonitoredOfficial source ↗Current GIA-specific reporting terminology for laboratory-grown diamond services; monitored separately from natural-diamond grading nomenclature.
Currentness: Time-sensitiveOfficial source ↗U.S. advertising and disclosure language for simulated and laboratory-created diamonds.
Currentness: MonitoredOfficial source ↗Croatian terminology database (Croatia); cited per subject field for the official Croatian form of a term. A term attested in one field is not automatically the gemological term.
Official source ↗Consumer-facing definition of branded diamonds and diamond cuts (a diamond with a patented or trademarked cutting style).
Official source ↗Table of proprietary and patented diamond cuts with patent and trademark status, inventor or owner.
Official source ↗