Effect of Colouring Element of Ruby from Different Localities on Its Colour Characterization
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摘要: 目前国内外珠宝市场上将红宝石产地归属作为品质评价的指标之一，因此，笔者选取市场上常见的三个产地(缅甸、莫桑比克、非洲)红宝石样品，通过X射线荧光能谱仪、紫外-可见-近红外光谱仪对其进行微量元素和颜色数值测试与分析。结果表明，缅甸红宝石样品中的微量元素表现为“富Cr贫Fe”，荧光较强，多呈紫红色；莫桑比克红宝石中Cr的质量分数与缅甸红宝石中Cr的相近，但前者含有一定量的Fe，其色调中紫色调较弱，明度值及彩度值受Fe元素的影响而有所降低，呈暗红色；非洲红宝石的微量元素表现为“富Fe贫Cr”，荧光极弱，明度值与彩度值较高，呈带粉色调的红色。Abstract: Due to different content of colouring element, the colour characterization of ruby from different localities is different. In this paper, the “locality” is one of indicators to evaluate quality of ruby on the market. Therefore, the authors selected three kinds of rubies with locality characteristics (Burma, Mozambique, Africa) as samples. By using X-ray fluorescence spectrometer, UV-visible-near infrared spectrometer, the trace elements and colour of the ruby samples were measured. On the basis of colorimetry, the ruby samples were classified and compared. The results were: (1) The trace elements of Burmese ruby present “Rich Cr poor Fe”, whose fluorescence is strong, and colour is purple red；(2) The Cr contents of Mozambique and Burmese rubies are similar, but the former has a certain content of Fe, and its purple tone becomes weaker, as well as the lightness and chroma value decrease. The Mozambique ruby is dark red; (3) The trace elements of African ruby present “Rich Fe and poor Cr”, with very weak fluorescence, and its brightness and chroma are higher, showing pinkish red colour.
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