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    June 29

    钻石鉴别

    钻石鉴别看了 CCTV7 军事频道一个节目总结了几个方法。
     
    滴水法
     
    真钻石能够让水珠长久圆润
     
    油性鉴别
     
    用油性笔划过,真的是连贯的。
     
    折光法
     
    真的金刚钻石,在黑暗处发出灼灼绿光,宛如电线上冒出的火花。如果是假金刚钻石,只能发出少量白光,甚至不能发光。即使发光,也显得很晦暗,没有交烁的现象。我们还可以将两种钻石一同放在一张黑色纸上,就能看出天然钻石保持光彩,而人造钻石则没有光彩,和玻璃很相似的。
    热量传递法
     
    可以用舌头识别真伪钻石,即用镊子夹住用舌头舔,因为钻石能迅速传递热量,所以舔上去感觉很凉,而比较起来,仿制品均能感较热。还有一个相方法是对着被别物呼哈气,在钻石上凝聚的水雾比在仿制品蒸发的快。因为钻石具有极高的热惯性,热量能很快补给上来。
    铅笔测量
     
    这种方法由前苏联一位专家发明,在鉴定之前,要先把钻石用水润湿,然后再用铅笔轻轻地在真钻石的晶面刻划,铅笔划过的地方是不留痕迹的;但如果是玻璃、水晶等材料制成的假钻,表面就会留下痕迹。

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