推荐回答（2个）
如何衡量钻石的优劣？首先应该对它基本知识有足够的解，判断钻石的好坏，应从钻石的颜色、结晶体的纯真度和造工三方面作为鉴定钻石质量的依据。从颜色判断质量是至关重要的一般来说，钻石以无色透明、纯真如水者为最佳。通常钻石多带色，如无色透明中带点淡淡的纯蓝，极好的色原素，称作 “ 水火色 ”。
中国的钻石以无色、淡黄、浅棕色为主，亦有绿、灰、橙色并见绿斑。因而，从钻石原材到加工综合来判断首饰优劣，钻石首饰的颜色越白越好，结晶体是透明纯洁的好，造工是新工规矩的好。反之，色黄或茶，结晶体含杂质，造工是老工不规矩的差。
换个角度讲，结晶水平高，完全透明，无瑕疵，颗粒越大越好，最贵重的钻石品种为 “ 白钻 ” 即成色 99 以上的“ 水火钻 ”“ 红钻 ”“ 粉红钻 ”“ 蓝钻 ”“ 金钻 ”“ 黑钻 ” 等。这些优良品种，重量在 3 克拉以上即为昂贵钻石，一般要求应不少于 0 ． 25 克拉。晶体越大越珍贵，若重量在 100 克拉以上者就是世界名钻了因钻石价格昂贵，赝品或通过各种人工技术以达到掩盖缺点、抬高品级的事是经常遇到所以鉴定真伪以及严格识别其质量品级是极为重要的。
钻石与玻璃料的区别在于，玻璃仿钻石的做工粗糙，性软，楞角和边缘易磨损，戴一段时间后，常出现不同程度的起毛现象，折光率差，光泽昏暗，将它顶面向下，底部向上，放在手上能透过手指纹。料器大部分底部涂有水银，增加反光率，但无论何种赝品都没有钻石的硬度大。真品虽经长期佩戴和饰用，均不会有丝毫起毛现象。如果有条件的话，采用钻石笔在钻石首饰底面边缘上一试，就可立断真假，这是最保险也最可靠的鉴别方法。
在钻石戒指内里有个ct（克拉）钢印，他前边的数字就是
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