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Grading >> Diamond
Shapes >> Round
Shape >> Crown Height
Crown
height percentage is calculated by dividing the actual
height of the crown by the average diameter. Measurements
are rounded to the nearest .01 millimeters. The crown
is the height of the diamond from the girdle edge to
the surface of the table facet. Crown height can effect
both the dispersion and brilliance of a diamond.
The AGS Ideal 0 Cut grade includes a narrow range of
crown height from 15 percent to 16.2 percent.
Diamonds with ideal to very fine cut proportions have
a crown height between the ranges of 13.1 and 16.2 percent.
It is difficult to
visually recognize differences in the appearance of
diamonds that have crown height within the range of
ideal to very fine.
Diamonds
that have crown height percentages that are lower
than 13 percent often have larger tables. This
often produces less brilliance and less dispersion
and fire. In contrast crown heights that are greater
than 16.2% give the diamond a lumpy, top-heavy
appearance, and disrupt the balance of fire and
brilliance.
If you have
any more questions concerning crown angles or
proper cut proportion, contact us. |
Depth % |
59% - 63% |
59% - 63% |
Table % |
52.4% - 57.5% |
51.4% - 62% |
Girdle Thickness |
Thin to Medium |
Very Thin - Thick |
Cullet Size |
None - Medium |
None - Medium |
Polsih |
Excellent |
Excellent to Good |
Symmetry |
Excellent |
Excellent to Good |
Flourescence |
None to Faint |
None to Faint |
Length to Width Ratio |
1 to 1 |
1 to 1 |
Crown Angle |
33.7% - 35.8 Degrees |
32.2 - 36.8 Degrees |
Crown Height |
15% - 16.2% |
13.1% - 16.2% |
Pavilion Angel |
40.5 - 41 Degrees |
39.7 - 41.7 Degrees |
Pavilion Depth % |
42.2% - 43.8% |
41.7% - 44.8% |
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Home >> Diamond
Grading >> Diamond
Shapes >> Round
Shape >> Crown Height
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