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15 Cards in this Set
- Front
- Back
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A transparent measuring device divided into millimeters and tenths of a millimeter, used to measure a diamond’s table, is called a |
table guage |
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The crown angle is the angle formed by the girdle plane and the |
bezel facets |
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When using the bowing method, star facets that reach one-third of the way toward the girdle make the lines appear |
to bow out |
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Most round brilliants have table percentages that range from about |
55 to 65 percent |
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An extremely thick girdle |
adds weight without contributing to the stone’s appearance.
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An advantage of the face-up method of crown-angle estimation is that it |
can be used even with mounted stones |
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A weight-retention method that adjusts the angles of some facets to allow portions of a diamond’s girdle to be thicker is called |
painting |
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Calculate the table percentage of a round brilliant with the following measurements: Table measurements: 4.85 mm, 4.85 mm, 4.90 mm, 4.95 mm Minimum and maximum girdle diameters: 7.95 mm, 8.07 mm |
61 percent |
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When using the ratio method for estimating table percentage, a 1:1¼ ratio indicates a table of approximately |
60 percent |
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What is the crown height percentage of a diamond with a crown angle of 32 degrees and a 60 percent table? |
12.5 percent |
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Calculate the total depth percentage of a diamond with the following dimensions: Depth: 4.70 mm Average girdle diameter: 6.54 mm |
71.9 percent |
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A round brilliant diamond’s table size is expressed as |
a percentage of its average girdle diameter.
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If a diamond’s total depth percentage is 51.0 percent, its cut grade will be |
Fair or Poor |
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On a well-made diamond, the girdle will |
have just enough thickness to prevent chipping.
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If a diamond’s minimum girdle diameter is 4.62 mm and its maximum girdle diameter is 4.65 mm, then its average girdle diameter is |
4.64 mm |
