OctoNus spread
Spread is a parameter that shows the difference between weight of a given diamond and weight of the standard
diamond. The standard diamond has the same area as the
given diamond but the standard diamond has Tolkowsky proportions with the medium girdle
thickness. The spread parameter tells 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
AGS Spread (ct) = (D / 6.47)3 - C
AGS Spread (%) = (1 - C * (6.47 / D)3) * 100%
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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