excellent/excellent fancy cuts (namely emerald)?????????

[windowshopper]

questions:

what percentage of fancies are excellent/excellent? compared to rounds? I am curious because in my search for cushions and EC''s I found so few where even one of the finish properties was even very good. why is this?

Id be curious to know specs on large and famous diamonds like cullinan, hope etc. Is it easier to have a beautiful EC with only Good/Good than say to yield a gorgeous round with only Good/Good?

 

[valeria101]

There are H&A rounds with "Good" symmetry - just not too many: imagine the seller would need to explain why his ideal rock is not top rated across the board - that''s hard

''Guess more rounds are cut to get those appealing words on lab reports ("excellent", "ideal" on finish) because there is so much more demand for rounds...

What difference the finish grades make - no idea. Facet-meet symetry hardly gets eye-crossing sloppy on modern diamonds. Perhaps the finish grades helped with this, but their job is done, I think.

I hope one of the cutters would intervene on this thread

 

[Paul-Antwerp]

Fancy shapes are generally cut from more irregularly shaped rough.

These irregularities also translate in areas of the diamond being very hard to cut, because of the crystallographic structure. Because of this reason, even if a cutter would try, there is more difficulty in obtaining ''excellent'' polish.

In the same way, because of the basic ''fancy'' shape, adapted more to the shape of the rough, it is more difficult to obtain ''excellent'' point-meet-symmetry. If you consider that it is easier to produce cutting-equipment for round-shapes, than for any fancy-shape, it is more difficult to control the exact position of a facet on a fancy-shape.

I hope that this helped.

Live long,

 

[windowshopper]

very much thank you