Optics/Proportions with OEC cuts ?

[treasurehunter]

How is it possible that these Ideal cut Old european Cuts have light return with such a high crown height combined with pavilion angles around 41.0 , Would it be better to cut to normal Ideal round cut proportions without pavilion main facets to give the same look ?
Or is the small table/culet essential to the look ?

 

[Karl_K]

The short lower girdles change the dynamics of which facets drive light return in an oec vs mrb.
https://www.pricescope.com/journal/do_pavilion_mains_drive_light_return_modern_round_brilliant

 

[Karl_K]

How is it possible that these Ideal cut Old european Cuts have light return with such a high crown height combined with pavilion angles around 41.0 , Would it be better to cut to normal Ideal round cut proportions without pavilion main facets to give the same look ?not sure what you are asking here
Or is the small table/culet essential to the look ?

small table.high crown yes it is a big part of makes them what the are.
open culet is more optional unless you love the kozibe effect(reflection of the culet in the crown mains) then you want a large one or bigger.

 

[diamondseeker2006]

August Vintage Rounds which were developed by Good Gold Gold are newly cut OEC's designed to have excellent-ideal light performance. You can see one in my avatar picture.

People buy OEC's for their charm and beauty overall and not light performance. When they were cut, candlelight was the common light source.

 

[treasurehunter]

Does anyone have a sarin file of an old european so I can look at it and try and understand this ..

 

[Karl_K]

Does anyone have a sarin file of an old european so I can look at it and try and understand this ..

not right off hand.
clarify what you want to know and maybe I can help you.