Good Crushed Ice diamond appearance in a cushion diamond with 69 facetsin HDR shop light.avi

This is a movie of a real diamond modeled 3D scan in DiamCalc with 12 reflections to get realistic imagery.
Good crushed ice diamonds appear from around 14 inches or 35cm to have an overal even array of very small flashes that 'roll' as the stone is rocked from side to side. There should be no easily identified larger dark zones (which can be most commonly the result of larger head obstruction, or leakage caused dark zones). All the flashes should be very small resuting in a pinfire effect.
The cause of the appearance of an exceptionally large number of facets is the many internal reflections which split the observed facet structure at each internal reflection.
The contrast between bright and dark areas is often contributed to positively by very small zones of leakage, where-as in well cut rounds the main cause of (larger) contrasting dark zones is obstruction as per the way the star effect often appears dark and with a slight movement the dark quickly flashes to a very intense bright zone.
A good crushed ice diamond will apear to have much less brightness when compared beside a good round, but the overall uniform brightness can make these stones appealing.
I have rarely seen good colorless crushed ice diamonds, but frequently see good examples in colored diamonds where there is a much larger premium for the skill and expertise involved in producing the color adding benefits resulting from the longer ray paths.

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Science & Technology

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• Ice
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• OctoNus
• RockyTalky
• Holloway
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