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15 Cards in this Set

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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

The crown angle is the angle formed by the girdle plane and the

bezel facets


When using the bowing method, star facets that reach one-third of the way toward the girdle make the lines appear

to bow out


Most round brilliants have table percentages that range from about

55 to 65 percent


An extremely thick girdle

adds weight without contributing to the stone’s appearance.


An advantage of the face-up method of crown-angle estimation is that it

can be used even with mounted stones

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


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


When using the ratio method for estimating table percentage, a 1:1¼ ratio indicates a table of approximately

60 percent


What is the crown height percentage of a diamond with a crown angle of 32 degrees and a 60 percent table?

12.5 percent


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


A round brilliant diamond’s table size is expressed as

a percentage of its average girdle diameter.


If a diamond’s total depth percentage is 51.0 percent, its cut grade will be

Fair or Poor


On a well-made diamond, the girdle will

have just enough thickness to prevent chipping.

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