kenny|1413681966|3769279 said:HCA will work for any round diamond D - Z or Fancy Colored.
... but good luck finding many round FCDs.
The round does not jack up the color strength in the top view, like other cuts such as radiant.
kenny|1413681966|3769279 said:HCA will work for any round diamond D - Z or Fancy Colored.
MelisendeDiamonds|1413684118|3769291 said:kenny|1413681966|3769279 said:HCA will work for any round diamond D - Z or Fancy Colored.
The HCA should only be applied to colorless modern round brilliants where the goal is to optimize brightness as well as provide balanced contrast and fire.
It does not apply where the goal is to intensify color in a round FCD. It does not apply when a balance of sparkle and color entrapment is preferred in a FCD. It does not work on cuts Old Cuts with shorter lowers where the CA/PA combination and table size can be dramatically different than a MRB.
Practically it doesn't apply to any FCD, theoretically the singular goal of optimizing brightness might apply to dark rough like dark brown (and very few other colors and saturations) but even then the lack of information on the grading report would limit its usefulness.
The goal balance for FCD even from deeply saturated rough (which does require color entrapment techniques) are balanced differently, thus its output is not applicable.
kenny|1413684612|3769293 said:MelisendeDiamonds|1413684118|3769291 said:kenny|1413681966|3769279 said:HCA will work for any round diamond D - Z or Fancy Colored.
The HCA should only be applied to colorless modern round brilliants where the goal is to optimize brightness as well as provide balanced contrast and fire.
It does not apply where the goal is to intensify color in a round FCD. It does not apply when a balance of sparkle and color entrapment is preferred in a FCD. It does not work on cuts Old Cuts with shorter lowers where the CA/PA combination and table size can be dramatically different than a MRB.
Practically it doesn't apply to any FCD, theoretically the singular goal of optimizing brightness might apply to dark rough like dark brown (and very few other colors and saturations) but even then the lack of information on the grading report would limit its usefulness.
The goal balance for FCD even from deeply saturated rough (which does require color entrapment techniques) are balanced differently, thus its output is not applicable.
Yes and no.
Yes, the colored diamond industry cuts for weight and color, NOT for light performance.
No, customers are free too look for whatever they want no matter now rare the industry makes it.
There is nothing about optics, physics or any other branch of science that makes the HCA not work when the dimaond material is colored.
You are taking about marketing.
Yes I realize my OEC green may not be favored by the HCA.
I have no idea since, as I stated earlier, GIA does not report crown and pavilion info in their FCD reports.
I have several superbly cut white diamonds and have owned around 25 FCDs and the green round has the best light performance of any.
Still, my point is customers are free to search for that rare round FCD that has good light performance.
Sorry.
I can understand that vendors of FCDs see my words as anathema when it comes to selling their inventory.