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OctoNus spread
The spread is parameter showing the difference between the
weight of the given diamond and the weight of the "standard
diamond". The "standard diamond" has the same area as the
given diamond but Tolkowsky proportions with the medium girdle
thickness. The spread parameter tells you if your diamond
looks more or less massive than it really is.
Tolkowsky proportions
| Weight |
1,00 ct |
| Diameter |
6,47 mm |
| Sec.diameter |
6,47 mm |
| Total depth |
4,00 mm |
| Crown height (bzl) |
16,2 % |
| Crown angle |
34,5 ° |
| Table diameter |
53,0 % |
| Pavilion depth (mains) | 43,1 % |
| Pavilion angle (max) | 40,75 % |
| Culet |
pointed |
| Girdle (valley) | Ex. Thin |
| Square deviation | 0,0 % |
| Star facets | 39,7 % |
| Lower facet depth | 82,0 % |
| Lower facet length | 80,5 % |
| Girdle (valley) |
1,0 % |
| Girdle (bazel) |
2,6 % |
| Girdle offcet | 0,0 % |
| Girdle offcet azimuth |
0,0 % |
| Fish eye |
10,31 % |
| Kozibe |
6,11 % |
| Spread |
0,00 ct (0 %) |
| AGS spread |
-0,1 % |
The spread parameter also works with fancy shapes comparing them
with round "standard diamond".
AGS spread
NW = C * (6.47 / D)3
C - weight of diamond (ct)
D - diameter of diamond (mm)
6.47 - diameter in mm of diamond with weight 1 ct and Tolkowsky proportions
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