The Effects of Indexed Upper Half Facets and 8*?

[joycer]

I finished reading the article by Peter Yantzer and from what I followed (I''m hardly any expert on cutting diamonds) the third example parallels an 8* firescope image by tweaking the girdles. Yet in the end of the article, the conclusion states:

"When setting the girdle at the halves and indexing the upper halves to 3, you can improve weight retention, but at the expense of optical performance and millimeter spread."

At the expense of optical performance and improvement of weight retention? That contradicts what I''ve read about 8* cutting. As far as I know, 8* claims to cut for what they perceive to be the highest optical performance at the expense of weight retention.

Could someone please explain???

-joycer

 

[strmrdr]

Diamond 3 with the 8* look is cut on a 1 index.
The diamonds arent in order by index.

Diamond 1 is a 2 index. <== normal
Diamond 2 is a 3 index <== Bad
diamond 3 is a 1 index. <== good

 

[joycer]

I thought it must have been something simple that I didn''t catch on to!
Thanks!

 

[Garry H (Cut Nut)]

Please put your comments about this article in the thread that is pinned at the top or we will have stuff everywhere