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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
 
Process flow

The process flow is suggested for colored diamond cutters. It is a modification of already existing cutting process flow. Initial data are collected with a rough diamond scanner and a spectrophotometer.

  • A few shapes can be selected for further planning on the base of their maximum and minimum light path corresponding with the size of rough stone.
  • A planner comes up with several allocation plans.
  • Color optimization process consists from two parts: computer optimization by color metrics in the case when we can develop mathematical definition and expert evaluation and study of optimization results for better appearance in various lighting and viewing conditions.
  • After good proportions are founded and fixed, we need to allocate these cuts one more time. At this stage the yield can be changed.
  • And if we still have more that one prospective solution, a cutter should decide which one is more preferable.

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