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GB/T 18303-2008 English PDF

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GB/T 18303-2008: Color grading of polished diamond by visual matching
Status: Valid

GB/T 18303: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 18303-2008English139 Add to Cart 3 days [Need to translate] Color grading of polished diamond by visual matching Valid GB/T 18303-2008
GB/T 18303-2001English199 Add to Cart 2 days [Need to translate] Colour grading of polished diamond by visual matching Obsolete GB/T 18303-2001

PDF similar to GB/T 18303-2008


Standard similar to GB/T 18303-2008

YB/T 4019   GB/T 16552   SN/T 0481.7   

Basic data

Standard ID GB/T 18303-2008 (GB/T18303-2008)
Description (Translated English) Color grading of polished diamond by visual matching
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard D58
Classification of International Standard 39.060
Word Count Estimation 6,661
Date of Issue 2008-05-26
Date of Implementation 2008-11-01
Older Standard (superseded by this standard) GB/T 18303-2001
Quoted Standard GB/T 15483.1; GB/T 16554-2003
Regulation (derived from) National Standard Approval Announcement 2008 No.9 (Total No.122)
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the basic conditions for the use of visual evaluation methods Diamond (already Cutting) Color (Cape Series) for evaluation, rules and arbitration. This standard applies to visual evaluation of color grade diamond has been processed after cutting and grinding. Has inlaid diamonds may refer to this standard.

GB/T 18303-2008: Color grading of polished diamond by visual matching

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Color grading of polished diamond by visual matching ICS 39.060 D58 National Standards of People's Republic of China Replacing GB/T 18303-2001 Diamond color grade visual evaluation method Posted 2008-05-26 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is GB/T 18303-2001 "color diamond color grade than the visual evaluation method" on amendments. The main difference between this standard and GB/T 18303-2001 are. Standard by name --- "color diamond color grade than the visual evaluation method" to "Diamond color grade visual evaluation method"; --- Diamond inspection light color temperature requirements to "5500K ~ 7200K"; --- "Colorimetric procedures" to "visual evaluation procedures," adds "direct visual evaluation," and adjust the original rules "Use visual colorimetric evaluation stone"; --- Increase the upper limit and a lower limit than the color stone stone colorimetric terms and definitions; --- Increased Chapter 6, "arbitration." The standard color by the National Standardization Technical Committee and centralized. This standard is drafted by. North Xinghua Gem Identification Center, the National Jewelry Quality Supervision and Inspection Center, Beijing Michael Jewellery Making Limited. The main drafters of this standard. SEGMENT jade, Yangfu Xu, Liu Yansheng, Wang Chunsheng, in the party. This standard superseded standard previously issued as follows. --- GB/T 18303-2001. Diamond color grade visual evaluation method

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.

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