Chromaticity Study of Emerald under Chelsea Filter

Zhou Qingchao, Liu Hao, A. Shen
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Abstract

In conventional gem identification methods, whether the emeralds turn red under the Chelsea filter can be used as an auxiliary evidence for emerald identification, but this identification standard has limitations. In order to more accurately describe the colour changes of emeralds under the Chelsea filter, this article applied the colorimetry method to convert the transmittance spectra that passed through the Charles filter into chromaticity coordinates. Thus, the colour changes of emeralds under Chelsea filter can be presented in the form of data. This article first studied the influence of testing angle of spectra, contact way between emerald and Chelsea filter, and model difference of Chelsea filters and other factors on the emerald's chromaticity under Chelsea filter. Then, the optical loss was analyzed during the process of passing through the Chelsea filter. Based on the optical loss, the modulation algorithm of the Chelsea filter for emeralds' spectra was established. The distribution of colour coordinates on the CIE 1931 chromaticity diagram corresponding to the natural emerald and synthetic emerald spectra modulated by Chelsea filter is identifiable. The location distribution of chromaticity coordinates can be used as a basis to distinguish natural emeralds from synthetic emeralds to a certain extent.
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切尔西滤镜下祖母绿色度的研究
在传统的宝石鉴定方法中,祖母绿在切尔西滤镜下是否变红可以作为祖母绿鉴定的辅助证据,但这一鉴定标准存在局限性。为了更准确地描述祖母绿在切尔西滤光片下的颜色变化,本文应用比色法将通过查尔斯滤光片的透射光谱转换为色度坐标。这样,祖母绿在切尔西滤镜下的颜色变化就可以以数据的形式呈现出来。本文首先研究了光谱测试角度、祖母绿与切尔西滤光片接触方式、切尔西滤光片型号差异等因素对切尔西滤光片下祖母绿色度的影响。然后,分析了通过切尔西滤波器过程中的光损耗。基于光损耗,建立了祖母绿光谱切尔西滤波器的调制算法。由切尔西滤光片调制的天然祖母绿和合成祖母绿光谱对应的CIE 1931色度图上的颜色坐标分布是可识别的。色度坐标的位置分布在一定程度上可以作为区分天然祖母绿和合成祖母绿的依据。
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