GB/T 18303-2008Color grading of polished diamond by visual matching (English PDF)
钻石色级目视评价方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 26, 2008
Implementation date
November 1, 2008
Scope
GB/T 18303-2008 is the English-translated version of 钻石色级目视评价方法.
GB/T 18303-2008 is the Chinese standard "Color grading of polished diamond by visual matching". Its scope clause reads: This standard specifies the basic conditions for the use of visual evaluation method Diamond (already Cutting) color (Cape series) evaluation procedures And arbitration.
This standard applies to the visual evaluation of color grade diamonds have been processed after cutting and grinding. Inlaid diamonds may have been referring to these standards.
Its clauses include terms and definitions; visual evaluation of the basic conditions.
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Document preview — GB/T 18303-2008
National Standard of the People's Republic of China
- ICS
- 39.060
- Classification
- D 58
- Replacing
- GB/T 18303-2001
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 visual evaluation of the basic conditions
1 Scope
This standard specifies the basic conditions for the use of visual evaluation method Diamond (already Cutting) color (Cape series) evaluation procedures
And arbitration.
This standard applies to the visual evaluation of color grade diamonds have been processed after cutting and grinding. Inlaid diamonds may have been referring to these standards.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 15483.1 ability to use inter-laboratory comparison of verification - Part 1. Development and operation of proficiency testing schemes
GB/T 16554-2003 diamond grading
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
A rigorous level color calibration for laboratory or commercial evaluation in treatment of the standard color sample diamond color grade alignment.
3.2
Located color it represents the upper limit of the colorimetric color grade stone.
3.3
Color is located in the lower level they represent colorimetric color stone.
3.4
Colorimetric placed stone and diamond color grade evaluation slot board.
3.5
For diamond evaluation related illuminance, color temperature and color rendering index lighting has certain requirements.
3.6
Diamond review surroundings, including indoor walls, floors, curtains, chairs, lamps, clothing and other evaluators of color, and the chamber
Light and other inside.
4 visual evaluation of the basic conditions
4.1 colorimetric stone
4.1.1
colorimetric stone only with a yellow tint.
Colorimetric stone clarity grade SI1 4.1.2 and above shall comply with GB/T 16554-2003 prescribed.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Similar standards
Editions of GB/T 18303
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 18303-2008 | Color grading of polished diamond by visual matching | current edition | Current |
| GB/T 18303-2001 | Color grading of polished diamond by visual matching | previous edition | Superseded |
This page sells the current edition, GB/T 18303-2008. Earlier editions are listed for reference only.
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