一颗IaB型辐照处理绿蓝色钻石的鉴定特征

Identification characteristics of a type IaB irradiated green-blue diamond

运用显微镜、紫外-可见光光谱仪、傅里叶红外光谱仪、光致发光光谱仪和钻石观测仪(Diamond view^(TM))在常温下对一颗绿蓝色钻石样品进行一系列检测,分析其形成原因以及颜色成因。傅里叶红外光谱显示该样品具有1175 cm^(-1)、1010 cm^(-1)等特征吸收峰,属于IaB型钻石;光致发光光谱显示其具有415 nm(N3)、438 nm、452 nm、648 nm、741 nm等特征发光峰,钻石观测仪(Diamond view^(TM))显示样品具有天然钻石生长特征,综合分析该样品是一颗天然成因的钻石;紫外-可见光光谱具有明显的741 nm(GR1)吸收峰和一系列与辐照相关的吸收峰(394 nm、667 nm),证明样品是经过了辐照处理。但没有发现样品具有明显的与辐照退火相关的缺陷,因此该样品是否经过后期的复合处理仍需进一步检测。

A green-blue diamond sample is detected at room temperature to analyze its formation and color formation by Microscope, UV-vis spectrometer, Fourier infrared spectrometer, Photoluminescence spectrometer and Diamond View. The FTIR spectrum reveals that the sample is type IaB, with absorptions at 1175 cm^(-1)and 1010 cm^(-1). The PL spectrum of the sample shows emissions at 415 nm, 438 nm, 452 nm, 648 nm and 741 nm. The diamond view^(TM) image shows that the sample has natural diamond growth characteristics. All the evidences indicate that the sample is a natural diamond. The UV-Vis spectrum shows a clear GR1 center defect at 741 nm, and a series of radiation-related absorption peaks(394 nm, 667 nm), which prove that the sample has been irradiated. The sample has no obvious defects related to irradiation annealing, so whether the sample has been treated by later composite treatment still needs to be further tested.