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How to measure the crown angle visually
2023-05-17 20:22:33
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Place the diamond table face up, visually measure the ratio of the image width of the pavilion main facet at the edge of the table to the image width of the main facet edge of the crown.
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The crown angle is the angle between the main facet of the crown and the plane. There are two commonly used visual methods.
1. The main facet image method of the pavilion (also known as the front view method) Place the diamond table face up, visually measure the ratio of the image width of the pavilion main facet at the edge of the table to the image width of the main facet edge of the crown.
The specific steps are:
Face up to the diamond, through the table, observe the width of the position where the image of a pavilion main facet is truncated by the edge of the table (blue line segment B), and then observe the intersection of the image of the same pavilion main facet and the edge of the crown main facet Width at position (red line segment A);
The smaller the crown angle, the smaller the difference between A and B, and the more continuous the image of the main facet of the pavilion; The larger the crown angle, the greater the difference between A and B, and the more discontinuous the image of the pavilion main facet.
Note 1: The premise of the description in the above observation is that the table width ratio of the diamond is 60%. Other ratios are listed in the table below.
Note 2: Due to symmetry defects, the angles of the main facets of each crown may be different, so it is necessary to observe and estimate the values of several crown angles, and take the average value.
2. Crown angle side view method Clamp the diamond girdle with a clip, set the tweezers to a 90° angle with the girdle, and then visually measure the crown angle
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