Diamond Cut Study
OctoNus Diamond
Cut Initiative
Publications
Rough and Polish diamond movies
Master Stone Set
Study of Interdependence:
Fancy-color Diamond Appearance, Cut, and Lighting Conditions
Fancy-Color Diamonds:
Better Color Appearance by Optimizing Cut

1 Content
2 Color optimization method
3 Diamond absorption spectra
4 Two representations of colors
5 A good fancy colored diamond should be bright and saturated
6 Color potential of a colored diamond plate
7 DiamCalc ray tracing options and photorealistic images
8 One spectrum different cuts and different lightings
9 Process flow
10 Exploring rough diamond potential
11 Rough allocation example
12 Different allocation plans
13 Automatic color optimization
14 Optimization by color
15 Optimization by contrast
16 Optimization results
17 Computer-aided color optimization
18 Expert considerations
19 The final stage: expert decision
20 Verification of the technology: CZ material
21 Real photos of CZ stones and photorealistic images based on Helium scanned 3d models
22 Verification on fancy shapes CZ
23 Summary
24 More information about diamond cut study technologies
25 Terms of colorimetry science (Hunt, 2004)
26 Acknowledges
27 References
Computer modeling of gemstones for improvement of their color appearance
Visible adsorption spectra and DiamCalc-files of colored gem materials
3DBook
DiamCalc Internal Cuts gallery
External Cuts gallery (Dll)
Diamond cuts gallery
 
DiamCalc ray tracing options and photorealistic images
The average ray path length is different for different shapes
DiamCalc photorealistic images: shapes made of the same material
Here there is some information about modeling abilities of Diamcalc software by OctoNus.

1. A user can work with parametrical cut or open a scanned 3D model - more realictic facet positions and symmetry deviations.
2. The single ray tracing mode can reveal light path coming to diamond from any point. One can see the difference between light path in the assher cut (left picture: light goes out after 2 internal reflections) and in oval cut (right picture: 7 internal reflections).
3. One can see a photorealistic image of a cut stone with given absorbtion spectrum. In a contrary to usual belief that the deeper stone will have more saturated color appearance it is shown that the flatter oval cut is more saturated because the average light path is longer. Important: photoreal images should be compared at the same illuminating and viewing conditions.

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