HOLLOWAY CUT ADVISER

Holloway  Cut Adviser ,HCA(何奴偉切割查詢器)( U.S. Patent 7,251,619 ) 估計一個圓形鑽石,基於其潛在的光反射,火,閃爍和直徑大小。

大多數人會想尋找範圍1-2之間的鑽石,其中:0-2優秀,2-4非常好,4-6好,6-8博覽會,和8-10差。零幾乎是不可能的,是因為許多因素各有衝突。

你需要4個數字。總深度%(Total Depth %),枱面%(Table %)和冠部角度(Crown deg)和亭部角度(Pavilion deg)。從2006年AGS和GIA和IGI報告。迴聲“一些報告列出不準確的樹冠圓形%和Pavilion%的;運行石頭,如果分數在2.0,要求零售商取到您報告與角度。

HCA沒有對稱(symmetry),拋光(polish)和切割面(minor facets)的資料;只用它來過容濾一些表現比較差的鑽石,縮小您的最終選擇。 八心八箭筒都能有幫助。

本網站有介紹了更多關於切割鑽石的資訊。HCA的詳細說明,請瀏覽 www.diamond-cut.com.au.

Trade should visit the business  HCA page. You have 3/3 HCA results.

Step 1 - Enter GIA/AGS report number or enter all fields
OR
Carat Size Weight
Depth %
Table %
Crown Angle
Pavilion Angle
Symmetry
AGS Ideal 
Excellent 
VeryGood 
Good 
Fair 
Poor
size in mm (optional)
Measurement [L.nn x W.nn x D.nn] x x
Step 2 - Verify parameters and final addition
H&A
Yes   
No 
   See sample HCA result
HCA diamond cut proportion diagram – crown and pavilion angles

*如果你有底尖%。

Carat 非常細 中度 輕微大 非常大 極大
0 – 1 0% – 0.45% 0.45% – 1.15% 1.15% – 1.95% 1.95% – 3.75% 3.75% – 4.455% 4.455% – 8.05% 8.05% – 12.05% 12.05% – 99.05%
1 – 5 0% – 0.35% 0.35% – 1.05% 1.05% – 1.75% 1.75% – 3.15% 3.15% – 3.75% 3.75% – 6.65% 6.65% – 10.05% 10.05% – 99.05%

亭部角度 VS 冠部及亭部%百分比

這是最好的輸入冠部和亭部角度,為HCA過那濾麼不太漂亮的鑽石。我們用三角學,從冠部和亭部%的數據計算角度。如果你有他們的角度就最好:

  1. 四捨五入,即13.3%冠部高度經常變成13%或13.5%。
  2. 亭深%時,轉換為亭角常都會低估了由0.15度的亭角
  3. 掃描儀不擅長測量底尖;一個尖底減少亭深%,但並不能改變亭角。

 

有時VG會比EX高分,但好難找到"完美切割"~

GIA Excellent Cut but 5.5 HCA? What gives?

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