天然粉色钻石的多光谱鉴定特征

Multispectral identification characteristics of the natural pink diamond

天然粉色钻石是非常稀有且珍贵的,前人对高温高压处理或辐照处理后或两者综合呈现粉色的钻石开展了一些研究,但对天然粉色钻石的研究较少。文章主要通过红外光谱、紫外可见漫反射光谱和光致发光光谱对3颗天然粉色钻石样品进行宝石学与光谱特征研究。结果表明:样品均为IaB型,红外光谱中存在片晶氮和氢杂质特征峰位。样品在紫外可见漫反射光谱图中均出现了550 nm附近的宽吸收带,为天然粉色钻石最重要的鉴定特征之一,可能与塑性变形有关。在光致发光光谱图中发现,样品在415 nm处和420~460 nm附近出现的一系列发光峰与N3缺陷中心有关。

The natural pink diamond is very rare and precious. Previous researchers have conducted some research on the pink diamonds and irradiation treatment diamonds of high temperature and high pressure treatment, but there are few studies on natural pink diamonds. In this paper, the samples are researched and analyzed for infrared spectrum characteristics, ultraviolet-visible spectrum characteristics and photoluminescence spectrum characteristics. The samples are of type IaB, and characteristic peak positions of lamellar nitrogen and hydrogen peaks are found in the infrared spectrum. The samples all show a broad absorption band about 550 nm in the ultraviolet-visible light spectrum, which is one of the most important identification features of natural pink diamond. It might be related to the plastic deformation. There is found in the photoluminescence spectrum that a series of luminescence peaks at 415 nm and 420-460 nm of the sample are related to the N3 defect center. The identification of natural pink diamonds is mainly based on identification features such as the type of diamond and the broad absorption band of 550 nm in the ultraviolet spectrum.