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:
- 四捨五入,即13.3%冠部高度經常變成13%或13.5%。
- 亭深%時,轉換為亭角常都會低估了由0.15度的亭角
- 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。
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.
*如果你有底尖%。
| Carat | 尖 | 非常細 | 細 | 中度 | 輕微大 | 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% |
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:
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2026-07-13 11:08:44
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Vantage Choices
2026-03-20 06:05:12
Ting Diamond service is so nice, Kelly and Melody have spent lot of time explaining various metrics and characteristics of diamond, providing very useful advices to us and we learn from newbies to a pretty professional diamond appreciators.
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2026-03-29 07:34:43