 The
crown angle is the angle between the bezel
facets and the girdle plane. It primarily
affects dispersion or the fire in a diamond.
The AGS Ideal
0 Cut grade includes a narrow range of crown
angles from 33.7 degrees to 35.8 degrees.
Diamonds
with ideal to very fine cut proportions
have crown angles between the ranges of
32.2 and 36.8 degrees. It is difficult to
visually recognize differences in the appearance
of diamonds that have crown angles within
the range of ideal to very fine.
| Shallower
crown angles produce less fire, especially
if the diamond has a large table.
When the crown angle is below about
32 degrees, it can reduce durability
by making the diamond susceptible to
chipping. In contrast crown angles steeper
that 36 degrees give the diamond a lumpy,
top-heavy appearance, and disrupt the
balance of fire and brilliance.
High crown angles also cause darkness
under the bezel facets. |
| 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% |
|
If you have any more questions concerning
crown angles or proper cut proportion, contact
us.
|
