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Table gauge An advantage of the face-up method of crown-angle estimation is that it Can be used with mounted diamonds. What is the crown height percentage of a diamond with a crown angle of 32 degrees and a 60 percent angle? 12.5 percent. An extremely thick girdle: A. makes a stone easier to set, B. Creates an unattractive fish eye effect, C. Reduces a stones durability during normal wear, D. Adds weight without contributing to the stones appearance D. Most round brilliants have table percentages that range from about 55 to 65 percent. The crown angle is the angle formed by the girls and and the Bezel facets. 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. On a well-made diamond, the girdle will Have just enough thickness to prevent chipping. A weight-retention method that adjusts the angles of some facets to allow portions of a diamonds girdle to be thicker is called Painting.