| Author | Topic: Angles: Crown & Pavillion |
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SFDiamond rough rock Posts: 1 |
posted 03-21-2001 02:19 PM
How do I learn/calculate crown & pavillion angles of my round diamond? |
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leonid Moderator Posts: 397 |
posted 03-21-2001 02:58 PM
Hi SFDiamond, Most accurate way of getting the angles is to get Sarin or Ogi measurements for the diamond. Sarin and Ogi machines are not rear anymore - many appraisers, jewelers and cutters have them and it is not expensive at all. Sometimes lab reports (AGS, EGL, HRD and others) already have crown and pavilion angles measured. If you are buying a stone you can ask your dealer to provide you with the Sarin measurements. |
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oldminer cut rock Posts: 43 |
posted 03-22-2001 10:44 AM
SFD: If you know or can measure the diameter, crown height, and table % or table diameter, you can then calculate the crown angle with the correct formula and a scientific calculator. The same holds true for calculating a pavilion angle. You need diameter, pavilion depth %, and if there is anything more than a small culet, culet size. You can also get these calculations automatically with the MSU DiamondCalc program without needing the correct formula or a calculator... I used to have the formula, but have not needed it for a long time. ------------------ |
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leonid Moderator Posts: 397 |
posted 03-22-2001 11:02 AM
Oldminer, the formulas are simple. But how to measure table, crown and pavilion depth accurately enough? I guess the accuracy should be 0.01 mm? |
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