Differences between Hearts n Arrows vs Ideal cut ?

[sporesam]

When a diamond is cut according to HnA standard,it may not have ideal cut proportion, BUT when a diamond is cut according to ideal cut proportion it may not have HnA effect.

To fulfill the criteria of AGS 000 grading,diamonds have to be within a tolerance range,but HnA diamonds have a wider set of proportion true?

I understand that all diamonds will display HnA pattern,the differences are how prefect the 8 hearts n 8 arrows are and how precise.

Anyone able to share the PROPORTION of a HnA diamond

tks

 

[Garry H (Cut Nut)]

Date: 5/19/2007 5:44:39 AM
Author:sporesam
When a diamond is cut according to HnA standard,it may not have ideal cut proportion, BUT when a diamond is cut according to ideal cut proportion it may not have HnA effect. H&A''s is a sign that a diamond has optimum optical symmetry across most (not all) facets.

To fulfill the criteria of AGS 000 grading,diamonds have to be within a tolerance range,but HnA diamonds have a wider set of proportion true? the ranges of proportions combo''s can be different - just as GIA and AGS disagree about what is best and what is not - so the proportions that show H&A''s patterns have their own rules of nature.

I understand that all diamonds will display HnA pattern,the differences are how prefect the 8 hearts n 8 arrows are and how precise. if H&A''s pattern is possible withing a given set of proportions - the cutter can fail to reach a desirable level of optical symmetry on the facets that cause the patterns. So the stone can have broken hearts or crooked arrows etc

Anyone able to share the PROPORTION of a HnA diamond there are many combo''s of crown, pav and table size, as well as minor facet combo''s - prbably about 10 days work to answer your question.

tks

 

[oldminer]

Garry is giving you technically correct and honest answers. In the real world, a H&A diamond is generally an Ideally cut one. There are many diamonds cut to rather excellent proportions which don''t perform as well as others cut nearly the same. The devil is found in the tiny details of cut, polsih, symmetry, small facet variations, clarity differences and transparency.

There are some very fine looking diamonds that do not show perfect H&A and there are some perfected H&A diamonds that do not perform at the very top range of light behavior. Most times, H&A, well cut and very fine performance do go together. For the sake of simplicity, this is a fortunate thing.

 

[denverappraiser]

Hearts and arrows don’t just happen by luck and there are plenty of stones that don't have anything recognizable as the pattern. The cutters do extra work to accomplish this. As Dave points out, in the real world this has some ramifications. For starters, they want to be paid for that extra work. They do it because they expect to sell the stone at a premium and they won’t be able to get that premium if the stone is seen as otherwise deficient. They know what they’re doing and cutters who are cutting H&A’s are also generally cutting to either AGS-Ideal or GIA-excellent standards as well and most will find that they benefit by also providing the documentation to prove it.

Neil Beaty
GG(GIA) ICGA(AGS) NAJA
Professional Appraisals in Denver