- Joined
- Apr 3, 2004
- Messages
- 33,852
Paul''s post echoes my thoughts. Often times, the differences between the stones are not just the H&A pattern, so it''s a bit presumptive to assume that a price differential is solely attributable to H&A (or not).Date: 4/3/2009 10:05:37 AM
Author: Paul-Antwerp
Hi DF,
I have thought about your question for a long time, and cannot really answer it. At least not the part about that claimed difference being correct.
To start, what is known as the H&A-effect can be acquired in many proportion-sets. These proportion-sets are not necessarily the best, and as such, even with H&A, these stones will not be the best looking. It is probably the main reason why there is a camp of non-believers in H&A and its positive effect on light performance. That is why we are anxiously waiting for scientific confirmation of our observations.
Back to topic: your original question also needs a definition of a non-H&A-stone, and I find this fairly difficult. You can have same weight, colour, clarity, that is clear. But does your comparison end if you take stones with the same average angles? I think that you can still find highly varying prices and performance-levels within this group.
All in all, I think that the difference in a real apple-to-apple-comparison is way smaller. But is very difficult to accurately define the apples.
Live long,
PaulDate: 4/3/2009 10:05:37 AM
Author: Paul-Antwerp
Hi DF,
I have thought about your question for a long time, and cannot really answer it. At least not the part about that claimed difference being correct.
To start, what is known as the H&A-effect can be acquired in many proportion-sets. These proportion-sets are not necessarily the best, and as such, even with H&A, these stones will not be the best looking. It is probably the main reason why there is a camp of non-believers in H&A and its positive effect on light performance. That is why we are anxiously waiting for scientific confirmation of our observations.
Back to topic: your original question also needs a definition of a non-H&A-stone, and I find this fairly difficult. You can have same weight, colour, clarity, that is clear. But does your comparison end if you take stones with the same average angles? I think that you can still find highly varying prices and performance-levels within this group.
All in all, I think that the difference in a real apple-to-apple-comparison is way smaller. But is very difficult to accurately define the apples.
Live long,
KarlDate: 4/3/2009 12:00:52 PM
Author: strmrdr
This brings up the old question of at what point is it good enough.
There is really no set answer to that question.
I believe that face up optical symmetry with a good angle combination should be the min. that most people should shoot for.
Beyond that the performance benefits are had to prove with current science but there are other valid reasons to go beyond it.
The difference will be found in extreme lighting conditions and in scintilation which is little understood today other than that looks better or not to detail oriented people.
Myself I love the craftsmanship that goes into the best cut diamonds and that makes it worth it to me at internet premiums but not at hof premiums.
If you go to the hearts and arrows tutorial here on Pricescope you will find a link to HRD that takes you hereDate: 4/3/2009 8:31:11 PM
Author: Dancing Fire
KarlDate: 4/3/2009 12:00:52 PM
Author: strmrdr
This brings up the old question of at what point is it good enough.
There is really no set answer to that question.
I believe that face up optical symmetry with a good angle combination should be the min. that most people should shoot for.
Beyond that the performance benefits are had to prove with current science but there are other valid reasons to go beyond it.
The difference will be found in extreme lighting conditions and in scintilation which is little understood today other than that looks better or not to detail oriented people.
Myself I love the craftsmanship that goes into the best cut diamonds and that makes it worth it to me at internet premiums but not at hof premiums.
can you please post some images with different combo specs inside the H&A cuts? like...good,better and best combo.
HCA under 2 with some shallow pavilion combos filtered out for contrast reasons if used in a ring and some combos added back in that are at 41 pavilion or just over that have long lgf%.Date: 4/3/2009 8:31:11 PM
Author: Dancing Fire
can you please post some images with different combo specs inside the H&A cuts? like...good,better and best combo.