GB/T 18303-2008
ActiveColor grading of polished diamond by visual matching
钻石色级目视评价方法
Catalogue
前言 → 1 范围 → 2 规范性引用文件 → 3 术语和定义 → 4 目视评价基本条件 → 5 目视评价操作规程 → 6 仲裁 Foreword → 1 Scope → 2 Normative References → 3 Terms and Definitions → 4 Basic Conditions for Visual Evaluation → 5 Visual Evaluation Operating Procedures → 6 Arbitration
Scope
This standard specifies the basic conditions, operating procedures and arbitration for evaluating the color (Cape series) of polished diamonds by visual matching. This standard is applicable to the visual evaluation of the color grade of cut and polished diamonds. Mounted diamonds may refer to this standard for implementation.
本标准规定了采用目视评价方法对钻石(已切磨)颜色 (Cape 系列)进行评价的基本条件 .操作规程和仲裁。本标准适用于已经加工切磨后的钻石色级的目视评价。已镶嵌的钻石可参照本标准执行。
Normative References
Keywords
Application Summary AI generated
Diamond testing laboratories, jewelry appraisal institutions, and diamond traders use this standard to visually evaluate the color grade of polished diamonds. It ensures consistency and comparability in diamond color grading, providing an authoritative technical basis for diamond trading and certification.
钻石鉴定机构、珠宝检测实验室和钻石贸易商使用本标准，通过目视方法对已切磨钻石的颜色等级进行评价。它确保了钻石颜色分级的统一性和可比性，为钻石交易和鉴定提供了权威的技术依据。
AI Summary AI generated
This standard specifies the basic conditions, operating procedures, and arbitration for visual color grading of polished diamonds (Cape series). It applies to cut and polished diamonds, with mounted diamonds allowed to refer to it. The standard sets requirements for master stones, diamond inspection lamps, and evaluation environment, and adds definitions for upper and lower limit master stones as well as an arbitration section.
本标准规定了采用目视评价方法对已切磨钻石（Cape系列）进行颜色分级的基本条件、操作规程和仲裁程序。适用于加工切磨后的钻石色级评价，已镶嵌钻石可参照执行。标准对比色石、钻石检验灯、评价环境等条件提出了具体要求，并增加了上限和下限比色石的定义，以及仲裁章节。
Key Sentences extracted from text
本标准规定了采用目视评价方法对钻石(已切磨)颜色 (Cape 系列)进行评价的基本条件 .操作规程和仲裁。
比色石只能带有黄色色调。
比色石的净度等级应符合 GB/T 16554-2003 中规定的 SII 及以上级别。
钻石检验灯的色温要求改为'5500 K~7 200K'。
增加了上限比色石和下限比色石术语和定义。
This standard specifies the basic conditions, operating procedures and arbitration for evaluating the color (Cape series) of polished diamonds by visual matching.
Master stones may only have a yellow hue.
The clarity grade of master stones shall comply with SII or above as specified in GB/T 16554-2003.
The color temperature requirement for diamond inspection lamps was changed to '5500 K~7200 K'.
Terms and definitions for upper limit master stones and lower limit master stones were added.
Standard Timeline
Changes from replaced version:
- 标准名称由《钻石色级比色目视评价方法》改为《钻石色级目视评价方法》
- 钻石检验灯的色温要求改为'5500 K~7 200K'
- 比色操作规程改为目视评价操作规程，增加了直接目视评价，并把原来的操作规程调整为使用比色石的目视评价
- 增加了上限比色石和下限比色石术语和定义
- 增加了第6章'仲裁'
- Standard name changed from 'Color grading of polished diamond by visual matching' to 'Color grading of polished diamond by visual matching' (Chinese name adjusted)
- Color temperature requirement for diamond inspection lamps changed to '5500 K~7200 K'
- Color matching operating procedure changed to visual evaluation operating procedure, added direct visual evaluation, and adjusted original procedure to visual evaluation using master stones
- Added terms and definitions for upper limit master stones and lower limit master stones
- Added Chapter 6 'Arbitration'