Primary internal terminology and context source across 105 chapters.
HOK-DIA-TERM-070 · 4Cs and grading
Color grade
A laboratory color grade assigned under the rules of a particular service and stone population. The D–Z scale is not the same as fancy-color grading.
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- colour grade
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Sources and authorities
The records below form the terminology basis for this entry or its category. This does not mean that every source defines every word on this page. The canonical manuscript remains the primary contextual source, while each external standard, laboratory policy, or regulatory guideline applies only within its own scope.
Widely used definitions for color, clarity, cut, carat and optical appearance terms.
Open official source ↗Current GIA-specific reporting terminology for laboratory-grown diamond services; monitored separately from natural-diamond grading nomenclature.
Open official source ↗U.S. advertising and disclosure language for simulated and laboratory-created diamonds.
Open official source ↗