Introduction to the function of the company's newly developed detector DD9
Release time:
2019-11-20 14:51
无色近无色钻石分辨天然/合成钻石 (DD9)
它集合了DD3和DD5以及新增加了偏光的测试，因此它是一台三合一便携式检测仪。
一、 先把适量钻石用磷光机(DD5)测试，显示画面中，变成整粒红色代表HPHT及部分CVD钻石。将整粒红色取出， 剩下部分区域显示红色及无色的钻石平均分散排放在托盘上，再重复测试，同样将整粒红色取出。剩下的钻石为天然或是CVD钻石。
二、 再用UV-ViS光纤机(DD3)测试前述磷光机剩下的钻石（显示红色的钻石不用再测），显示Ia型的为天然钻石。
三、 上述显示非Ia型的钻石，再用正交偏光镜在显微镜下观测，可以分出无全面条纹和有全面条纹两种，其中无条纹及仅区域条纹的就是天然钻石。
有全面条纹的又可分为两种：
1，条纹均为“粗疏歪斜”为CVD钻石；条纹为彩色者未经改色，条纹为灰蓝色者已经改色.
2，条纹部分有 “细密平直”的榻榻米状交叉条纹为原天然褐色IIa型钻石经HPHT改色变无色钻石。
没有条纹或者只有部分条纹的是天然钻石。
如此可以完成分辨出天然/合成钻石。
正交偏光镜+显微镜使用方法
在宝石双目显微镜的载物台上置放一个折叠偏光镜，关掉上方的灯光，打开下方的底光，转至正交偏光时，用摄子摄在钻石台面及尖底，置于上下两片偏光镜之间，从钻石腰围附近的冠部、亭部观察，调整背光的明暗，用棉花棒沾酒精擦拭并转动钻石，观察钻石冠部、亭部面上异常双折射的形状及颜色。
正交偏光图像CPF
CVD钻石的生长原理是一颗颗具有4个键的碳原子，连续由上而下沉积在钻石基片上。所以CVD钻石是由下而上平行柱状生长的，在正交偏光下可以看到整个钻石由生长表面至内部由应力产生的异常双折射，整个钻石内部充满了彩色至灰蓝色的平行柱状生长结构.
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