钻石揭秘系列之四, 常见的误解 八心八箭 vs. 完美车工 相同吗？

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理想切割公式

八心八箭 vs. 完美车工
完美车工
光辉闪耀 Brilliance ，重量节省 Weight Saving ，和 理想切工 ideal cut 有密切相关. 他们包括了 1. 技术工人，2. 高技术，3. 牺牲重量而获得最大的辉煌

理想切割公式 Ideal Cur Formula 是一个对钻石辉煌的较大贡献者

上图显示了理想切割公式
台面 53-58%
冠部 14.5-16.2%
亭部 42.4-43.5%
腰部 薄 –略厚
底尖 没有，非常小

例如2 克拉钻石原石.
钻石切割厂可以选择以
理想的公式，生产出一个最光辉闪耀的钻石. 85克拉EXEXEX，
或为了最大限度地提高重量，他可以生产出1克拉VGVGG一个不漂亮的钻石

(下图) 粗腰部会减少的钻石辉煌,但可以增加多达10％的重量， 也可能有八心八箭

八心八箭另一方面，主要涉及钻石的对称性.如果对称 symmetry 性评为优秀 excellent ，可能90％已上可以看出有八心八箭的效果

八心八箭效果与钻石的比例联想较少，因此贡献钻石的光辉不大. 完美的对称是对已经完美切割钻石一个加分的因素. 记住，不理想的切割钻石（non ideal cut太厚或太薄但有完美对称），也可能有八心八箭的效果. 只可惜八心八箭不会影响钻石的光辉或亮度的效果

对于以价格来言，理想切割钻石ideal cut (带或不带八心八箭效应都可以) 比八心八箭（H&A non ideal cut非理想切工）钻石是昂贵得多，

下图显示了不良八心八箭钻石，没有光辉闪耀
最下图显示了 锯 或 没锯的钻石大 vs 小台面



结论是什么？如何用最简单的方法区分 八心八箭 和 灿烂的好钻石？最终的解决办法是光性能相关的 角谱评估工具ASET. 下一次显示答案 

 



Common misunderstanding

Hearts & Arrows vs Ideal Cut

Ideal Cut
Brilliance, weight saving and ideal cut are closely related. Their counter part includes skilled workers, improved technology, and sacrificing yield to obtain maximum brilliance.

Ideal Cut formula is the MAJOR contributor to the brilliance factor of a diamond.

1． Diamond Table 53-58%
2． Diamond Crown Angle (crown height 14.5%-16.2%)
3． Diamond Pavilion Angle (pavilion height 42.2%-43.5%)
4． Diamond Girdle thickness (Thin-slightly thick)
5． Diamond Culet (pointed)

Diamond cutter can choose to follow the ideal cut formula in order to produce the most brilliant diamond from a rough diamond eg 2carat to say .85 carat EXEXEX, or in order to maximize the weight, he can produce a not so beautiful diamond at 1 carat VGVGG




Thick girdle can reduce the brilliance of a diamond but can increase its weight by as much as 10%

Maximizing the yield


Hearts and Arrows on the other hand relate mostly to the symmetry of a stones. If the symmetry is rated as excellent, it is 90% likely that the Hearts and Arrows effect can be seen

Hearts and Arrows effect has much less association to the proportion of a diamond, therefore contributed very little in the brilliance of a diamond. Perfect symmetry is a PLUS factor to the already ideal cut diamond. Remember, non ideal cut diamond (too thick or too thin) with perfect symmetry can also have H&A effect. Unfortunately only the H&A does NOT have any effect in the beauty or brilliance of a diamond.

With regards to price, ideal cut diamond (with or without hearts and arrows effect) is much more expensive than the hearts and arrows diamond.

What is the conclusion? How to distinguish a good and brilliant diamond from this Hearts and Arrows mystery? The ultimate solution is the Light Performance related Aset (Angular Spectrum uation Tool). 





坏切割，厚或薄的钻石也可能会显示八心八箭效果