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How to Visually Measure the Table Aspect Ratio of a Diamond
2023-05-16 20:22:33
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The mesa diameter is defined as the inner diagonal of a regular octagon. Estimate the ratio of half of the inner diagonal to the girdle radius to determine the table width ratio.
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There are two commonly used methods for visually estimating the station width ratio.
1. Ratio method (direct estimation method) The mesa diameter is defined as the inner diagonal of a regular octagon. Estimate the ratio of half of the inner diagonal to the girdle radius to determine the table width ratio.
The specific steps are: the line of sight is perpendicular to the table, and the three points A, B, and C in the figure are connected by an imaginary straight line, and the value of AB:BC is visually measured, which is the table width ratio.
2. Radian method When viewed vertically on the table, the table and the star facets of the round diamond are in the same plane, and it can be seen that the table and the star facets form two overlapping "squares", according to the arc size of the 8 sides of the two "squares" to determine the table width ratio.
When the edge of the "square" is a straight line, the table width ratio is 60%
When the edge of the "square" is slightly curved inward, the table width ratio is about 58% When the edge of the "square" is obviously curved inward, the table width ratio is about 54%
When the sides of the "square" are slightly arched, the table width ratio is about 62% When the edge of the "square" is obviously arched, the table width ratio is about 66%
And so on...
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