钻石颜色分级定量化技术的研究（英文）
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摘要
美国宝石学院19世纪30年代起,首先建立了一套成熟的钻石颜色分级系统。传统上,钻石颜色分级靠目视以及与成套标准比色石比较确定。目视分级结果被一些因素如检验环境、钻石尺寸,分级人员等所影响。因此经常出现对一个样品,即使是同一个人在相同环境分级检测也容易出现分级偏差。为了避免上述问题,利用检测设备来评估钻石颜色,成为钻石领域的一个研究热点。可是目前没有达到评估钻石颜色分级的要求。该研究给出了一个有意义的方法来定量表征钻石的颜色。该方法使用显微微区定位检测方法来定量评估钻石颜色,同时该方法可以避免钻石尺寸大小对钻石颜色分级的影响。可见光分光光度计原理被使用在该方法。该方法由样品系统、微区定位显示系统、信号收集与计算系统组成。D65光源被使用,并且色温保持在(6 500±200) K;高分辨率CCD探测器作为信号采集设备。该方法准确检测了几套不同大小和颜色的带国家(中国)标准证书的钻石样品,结果表明,该方法能够快速、准确的测量钻石的颜色坐标,并自动转换为钻石分级系统对应的颜色分级级别,同时靠使用微区定位检测技术,对圆钻型钻石测试能够排除钻石尺寸引起的颜色分级偏差。该方法对钻石分级是一个有益的潜在技术。
Diamond color grading has been firstly designed to form a set of mature grading system by Gemological Institute of America. Traditionally, diamond color grading method is to observe the sample visually and compare it with a set of standard colour master stones. The classification results are mainly affected by the testing environment, size of diamond, inspectors and so on. Then, grading deviations will always exist for the same sample, even if it is tested by the same person in the same environment.To avoid the above problems, it has been a hot research topic in diamond field to use an excellent instrument to evaluate the color of diamond. However by now, there have not yet been any instruments which can completely meet the requirement for the grading of diamond. This paper gave an interesting method for quantitative evaluation of diamond color,and the micro zone measurement was applied and proposed to avoid the effect of size variation results in color grading of the diamonds. The principle of spectrophotometer was used in the method, which consisted of a sample system, a micro positioning display system, an automatic acquisition and calculation system. D65 light source was employed and its color temperature was(6 500±200) K. The color signal acquisition was realized by CCD optical fiber spectrometer with high speed, high resolution and large pixels. Several sets of master diamonds with the national(China) standard certificate and with different sizes and different colors were employed to test. The results showed that the method could obtain the index of the color of the diamond accurately and could transform to the degree of diamond grading color system. By using the micro area accurate positioning method, selected the common features of the diamond pavilion measurement area, which could eliminate the errors of the same color grade diamond due to the size. The method is a potentially useful technology for diamond color grading.
Diamond color grading has been firstly designed to form a set of mature grading system by Gemological Institute of America. Traditionally, diamond color grading method is to observe the sample visually and compare it with a set of standard colour master stones. The classification results are mainly affected by the testing environment, size of diamond, inspectors and so on. Then, grading deviations will always exist for the same sample, even if it is tested by the same person in the same environment.To avoid the above problems, it has been a hot research topic in diamond field to use an excellent instrument to evaluate the color of diamond. However by now, there have not yet been any instruments which can completely meet the requirement for the grading of diamond. This paper gave an interesting method for quantitative evaluation of diamond color,and the micro zone measurement was applied and proposed to avoid the effect of size variation results in color grading of the diamonds. The principle of spectrophotometer was used in the method, which consisted of a sample system, a micro positioning display system, an automatic acquisition and calculation system. D65 light source was employed and its color temperature was(6 500±200) K. The color signal acquisition was realized by CCD optical fiber spectrometer with high speed, high resolution and large pixels. Several sets of master diamonds with the national(China) standard certificate and with different sizes and different colors were employed to test. The results showed that the method could obtain the index of the color of the diamond accurately and could transform to the degree of diamond grading color system. By using the micro area accurate positioning method, selected the common features of the diamond pavilion measurement area, which could eliminate the errors of the same color grade diamond due to the size. The method is a potentially useful technology for diamond color grading.
引文
[1] Zhang Peili.Systematic Gemology.Geology Publisher,2006.
[2] GB/T 16554—2017.Diamond Grading.
[3] Liu Y.US Patent:No.7652755.
[4] Wang Hui,Chen Meihua,Zhong Xiangtao.Super Hard Material Engineering,2014,24(2):54.
[5] Yang Ye,Chen Meihua,Hu We.Super Hard Material Engineering,2014,24(1):54.
[6] Cheng Youfa,Liu Haibin,Fan Chunli,et al.Journal of Synthetic Crystal,2014,46(1):174.
[7] Lapa D,Marc Frans Alida Van de Velde.US Patent:No.8116552.
[8] Ruan Yaohua.China Science and Technology Overview,2016,14:210.
[9] Wu Wenjing,Shi Bin,Xu Zhongtian.Journal of Gems and Gemology,2017,19(1):37.
[10] GB/T 9086—2007.The White Standard Plate for Colorimetry and Photometry.
[2] GB/T 16554—2017.Diamond Grading.
[3] Liu Y.US Patent:No.7652755.
[4] Wang Hui,Chen Meihua,Zhong Xiangtao.Super Hard Material Engineering,2014,24(2):54.
[5] Yang Ye,Chen Meihua,Hu We.Super Hard Material Engineering,2014,24(1):54.
[6] Cheng Youfa,Liu Haibin,Fan Chunli,et al.Journal of Synthetic Crystal,2014,46(1):174.
[7] Lapa D,Marc Frans Alida Van de Velde.US Patent:No.8116552.
[8] Ruan Yaohua.China Science and Technology Overview,2016,14:210.
[9] Wu Wenjing,Shi Bin,Xu Zhongtian.Journal of Gems and Gemology,2017,19(1):37.
[10] GB/T 9086—2007.The White Standard Plate for Colorimetry and Photometry.