粉钻，稀有而珍贵。仅仅是配镶用的碎钻也让小编直呼“买不起”!但是你买的粉钻，真的就是钻石吗?没有权威证书的散货存在着极高的风险——有可能你就会买到这样一颗宝石：

　　Coated Pink Synthetic Moissanite

　　覆膜粉色合成碳化硅(莫桑石)

　　Figure 1. This 0.41 ct pink stone was revealed to be a coated synthetic moissanite. Photo by Aurélien Delaunay.

　　图一：这块0.41克拉的宝石被确定为覆膜的粉色合成碳化硅(莫桑石)。摄影：Aurélien Delaunay。

　　The French Gemmological Laboratory (LFG) recently received a 0.41 ct pink stone resembling a pink diamond (figure 1) for identification. The surface of the stone showed numerous patches (figure 2), casting doubts about the natural origin of its color.

　　法国宝石学实验室(LFG)近期收到一块鉴定用的宝石样品，该样品质量为0.41克拉，呈粉红色，类似粉钻(图1)。放大检查发现，这块宝石表面附着着一些细小的斑块(图二)，这引起了大家对该宝石颜色天然与否的怀疑。

　　Figure 2. Metallic flakes on the surface raised questions about the origin of the pink color. Photomicrograph by Aurélien Delaunay; field of view approximately 1.8 mm.

　　图二：表面斑驳的金属光泽斑点使大家产生了关于颜色成因的疑问。显微摄影：Aurélien Delaunay，视域约1.8毫米。

　　Under the microscope, these flakes showed metallic luster. Furthermore, the pink color appeared concentrated at the surface. Some unevenness in the color was observed due to scratches of this film. When observed through the crown, the gem showed a clear doubling of its edges, indicating an anisotropic material. These observations confirmed the client’s doubts that the gem was a pink diamond (figure 3).

　　显微镜下，这些斑驳的斑点呈现出金属光泽，而且宝石的粉红色显得集中在表面，一些宝石表面上的划痕也能观察到颜色的不均一。当观察宝石冠部时可见明显的刻面棱重影，这表明了宝石本身的材料具有各向异性，这些观察证实了客户对“这颗宝石是一颗粉色钻石”这一观点的怀疑(图3)。

　　Figure 3. Doubling of the edges, observed near the crown in this synthetic moissanite. Photomicrograph by Aurélien Delaunay; field of view approximately 3.4 mm.

　　图三：在这块合成碳化硅的冠部附近观察到刻面棱重影。显微摄影：Aurélien Delaunay，视域约3.4毫米。

　　The sample was analyzed using infrared, UV-visible, and Raman spectrometers. All the spectra collected indicated a synthetic moissanite coated with a colored film. Chemical study of this film acquired with an EDXRF spectrometer revealed that iron and titanium were responsible for the color of the calcium-rich film.

　　样品经过红外光谱、紫外-可见光谱及拉曼光谱分析，所有的谱线结果均表明这是一块镀有有色薄膜的合成碳化硅(莫桑石)。EDXRF光谱仪(X射线荧光光谱仪)的检测结果表明，这是一种富钙质的薄膜，而铁元素与钛元素是这块薄膜致色的原因。

　　This is the first example the LFG has seen of synthetic moissanite coated with a thin colored film. This type of treatment is not rare with topaz, quartz, diamond, or tanzanite. Gemologists must remain vigilant because this treatment can be performed on all gems, natural or synthetic.

　　这是LFG检测到的第一例覆有色薄膜处理的合成碳化硅，相对而言这样的处理方法在托帕石、水晶、钻石与坦桑石中并不少见。针对这种处理方法，所有的宝石从业人员都需要保持警惕——因为包括人造宝石、合成宝石与天然宝石在内的所有宝石都可以使用这种方法进行处理。

　　所有的宝石在没有证书的情况下购买都是存在一定风险的，专业的买手和权威机构的鉴定证书可以很大程度上避免这样的情况发生!