白色“电镀”淡水珍珠的鉴别特征

Identification Characteristic of White “Electro-Deposition” Freshwater Pearl

  • 摘要: 近几年,中国市场上出现了一种强至极强光泽的淡水珍珠,业内称之为“电镀”珍珠。为有效鉴别该“电镀”珍珠,以白色淡水珍珠、常规增光漂白淡水珍珠和白色“电镀”淡水珍珠为研究对象,采用常规宝石学测试、红外光谱、扫描电子显微镜及能谱仪测试手段进行分析,结果发现,白色“电镀”淡水珍珠的光泽普遍强于白色淡水珍珠和常规增光漂白珍珠,前者的折射率和相对密度与白色淡水珍珠相当;白色“电镀”淡水珍珠的紫外荧光显示为浅蓝色,弱于常规增光漂白淡水珍珠;显微放大观察,白色“电镀”淡水珍珠表面反射光强,呈单一金属色,佩戴磨损后呈不规则斑状分布。扫描电子显微镜的测试结果显示,白色“电镀”淡水珍珠表面可见明显的不规则凸起,呈溅射状分布。能谱仪测试显示,白色“电镀”淡水珍珠低洼处Ti元素的质量分数可高达3.74%,这可作为“电镀”珍珠的鉴定依据之一,且其光泽强度与Ti元素的质量分数呈正相关。

     

    Abstract: Recently, a kind of freshwater pearls being strong to very strong luster have appeared on the jewelry market in China, which are called "electro-deposition" pearls.For studying the identification characteristics of these "electro-deposition" freshwater pearls, the authors collected and tested the white freshwater pearl, bleaching freshwater pearl, and "electr-deposition" freshwater pearl samples by using the conventional gemmological methods, infrared spectrometer, scanning electron microscope and energy dispersive spectrometer.The results showed that the luster of white "electro-deposition" freshwater pearls was stronger than the others, and its refractive index and relative density were similar with white freshwater pearl.The ultraviolet fluorescence of white "electro-deposition" freshwater pearls was light blue, which was weaker than that of bleaching freshwater pearls.The strong reflected light and metallic colour of white "electro-deposition" freshwater pearls could be seen by the gem microscope.The scanning electron microscope testing result indicated that the surface layer of white "electro-deposition" freshwater pearls was anomaly bulge as sputtering distribution.Energy dispersive spectrometer testing showed that content of Ti element in the low-lying place of white "electro-deposition" freshwater pearls was 3.74%, and its content was positively correlated with the luster intensity, which can be used for identification characteristic.

     

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