Do you mean not "true" hearts and arrows, as in the patterns being finicky in exact in proportion to each other? Such as what's shown here where the one on the right isn't considered a "true" H & A?
Shiatsu - The example you gave above would have negligible visible difference. You can find diamonds with ideal parameters that show more distorted patterning. There are some examples at the bottom of this thread.Date: 1/6/2007 2:01:42 AM
Author: shiatsu
Do you mean not 'true' hearts and arrows, as in the patterns being finicky in exact in proportion to each other? Such as what's shown here where the one on the right isn't considered a 'true' H & A?
Or are there actual examples of a traditionally cut GIA Ex/Ex/Ex or AGS 000 with no resemblence of hearts and arrows whatsoever under an H & A viewer? Because If such a stone exists, could somebody post it as an example? And could somebody tell me what the odds are of coming across such a stone?
Sorry Ira, we don't send diamonds to HRD so my insight is limited. My knowledge is along the lines of what was mentioned in the other thread: CGL's H&A grading has been included via a stamp on the sorting memo with a drawing of either H&A, hearts only, or no pattern at all. The concept is not new; other labs have provided a similar service. Here is an example. I share Paul's understanding; the H&A grading tends to be lenient, so what value it has depends on what standards you're seeking.
Interesting, thanks. How often do you come across a stone with Ex/Id cuts and symmetry but such very distorted H & A? If you get a stone with Ex/Id grade cut and symmetry, what are the odds it will show no resemblence to H & A whatsoever under the H & A scope? Because so far everything I've seen with a top grade cut and symmetry shows some fashion of hearts and arrows, though it may not always be perfect.
With a strong desire to be a fly in the ointment, the relationship between decent H&A''s patterns and proportions probably only exists in people minds because people rarely bother to look at not so great proportioned stones with a H&A''s scope. I am not suggesting that is the case at ACA (not for a minute).
Date: 1/7/2007 8:34:36 AM
Author: Lynn B
John,
THANK YOU for your post above, picturing the 4 diamonds. For me, that is one of the single most interesting posts I have ever read!
I have long often wondered the same thing... what exactly would non-H&A, (but well-performing) stones LOOK like... and what might their specs be? Your post answered those questions in a succint, easy-to-understand way that I can't remember ever reading before.
Thank you so much!
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