染色金黄色海水珍珠的宝石学特征及鉴定

Gemmological characteristic and identification of dyed golden seawater pearl

通过常规宝石学方法以及红外光谱、紫外可见吸收光谱X射线荧光能谱对染色金黄色海水珍珠的宝石学特征进行研究。结果表明:染色金黄色海水珍珠表面有排列紧密的“等高线”状生长纹,放大观察有黄色染料残留富集等明显的染色特征;染色金黄色海水珍珠的红外光谱与文石图谱相吻合,紫外可见吸收光谱具283 nm和425 nm吸收峰,缺失天然黄色海水珍珠特征的360 nm吸收峰;染色与天然金黄色海水珍珠的X射线荧光光谱极为相似,都出现Ca+Zn+Sr的元素组合关系,且Sr/Ca的比值为0.50~0.65。

In this paper,Gemmological characteristic and identification of the dyed golden seawater pearls are tested with the conventional gemological methods,FT-IR,UV-VIS and XRF.The results indicate that there are closely arranged"contour"shaped growth patterns on the surface of samples.The dyed golden seawater pearls show obvious signs of dyeing with dye aggregation,and their infrared spectrums are consistent with the aragonite spectrum.The characteristic peaks of the dyed golden seawater pearl appears around 283 nm and 425 nm in the UV-VIS refletion spectra,which miss the unique 360 nm absorption peak of golden seawater pearl;The X-ray fluorescence spectrum of the samples show a combination of Ca+Zn+Sr elements,In addition the Sr/Ca ratio is 0.50-0.65.