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 » RockyTalky
»  » Can Very Good grading really mean Excellent?
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Can Very Good grading really mean Excellent? |
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| P: 7/21/2007 8:40:46 PM | |
kong Rough Rock Total Posts: 21 Last Post: 8/5/2007 Member Since: 7/11/2007 |
So my diamond comes in at a 1.7 (excellent) on the HCA calculator and excellent on the GIA site calculator. But the GIA statement grade is Very Good. I'm told by Garry it's due to the girdle which is slightly thick to thick (which defaults it out of Excellent and into Very Good). But all things considered, I'm curious what I'm sacrificing. Anything? My initial guess would be spread (as some of the weight is in the girdle), but the spread comes up excellent on HCA (probably due to the 61% table). My next guess would be light performance, but I've read on numerous sites the slightly out of ideal range girdle has absolutely no meaningful effect on light performance. So the cut adds up to Excellent light performance and Excellent spread. Assuming I'm fond of a slightly larger table (which GIA now recognizes as subjective) for all intents and purposes, shouldn't this be considered an Excellent graded cut as all the positives seem to be here? Should I look at it as a steal for getting a Very Good grade price? I'm not looking for validation here. I'm just trying to better understand grading/pricing. Obviously if the girdle was medium throughout you'd rank even higher on the "excellent" side. So....is it as simple as this: If you like a slightly bigger table %, you can afford a little weight to go to the girdle which defaults it to a lower grade which saves you money. Am I on to something? Am I way off? |
| Posted: 7/21/2007 8:40:46 PM | |
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There are 4 replies to this message. There are 4 replies on this page. |
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| P: 7/21/2007 9:00:42 PM | |
diamondseeker2006 Ideal Rock Total Posts: 17,609 Last Post: 11/18/2009 Member Since: 1/11/2006 |
I don't think the table determines the spread. I think it is the diameter. What are the measurements of your stone? (diameter and depth percentage) It's okay for you to love a stone that is graded as very good. Diamonds do not have to have perfect numbers to be beautiful. But on the other hand, just because we like something doesn't mean the grade should be excellent. Consider that it is accurately graded as very good, and you are buying it because it looks excellent to you.
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| Posted: 7/21/2007 9:00:42 PM | |
| P: 7/21/2007 9:39:07 PM | |
denverappraiser Ideal Rock Total Posts: 4,614 Last Post: 11/22/2009 Member Since: 7/21/2004 |
This highlights one of the problems of labs and cut grading. ‘Excellent’, as GIA uses it is fairly specific with regard to what it means but this does not mean the same as ‘best’. There are some smoking good diamonds that GIA calls ‘Very Good’, that AGS would give a ‘3’ or worse and that generally don’t fit the model of what the labs are grading for. Deciding which cut is the most beautiful is an impossible task and the smart folks who built the scales at the labs are well aware of this. Beauty is in the eye of the beholder. In order to avoid this problem they have narrowed down the question to one that is possible. Instead of trying to make a scientific judgment of beauty, GIA did a rather large study with people observing a variety of different stones in a variety of different lighting environments and reporting their preferences. This is a measure of popularity, which IS possible to measure, at least within a particular population and at a particular time. AGS is using a raytracing program to evaluate the optics of a stone and comparing it against a standard that they call ‘ideal’, which is another way of reducing the question to one that’s possible. In the end, there are awesome stones out there that some folks will love that will grade out as VG, G or even P and neither GIA nor AGS would argue that they are inferior to the ones they give their highest grades. They are different, but different doesn’t mean bad. Neil Beaty GG(GIA) ICGA(AGS) NAJA Professional Appraisals in Denver There's never a crowd when you go that extra mile. |
| Posted: 7/21/2007 9:39:07 PM | |
| P: 7/21/2007 9:55:48 PM | |
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kong Rough Rock Total Posts: 21 Last Post: 8/5/2007 Member Since: 7/11/2007 |
Here's the measurements. On the GIA scale, they come in as Excellent. Just not on the statement. Again, I guess this is due to a little weight being stored in the girdle. I guess the reason I'm confused is because the spread comes in as excellent. So I'm still curious as to what's missing. Table 61% Depth 59.9% Pavillion- 41 degrees Crown- 33 degrees Symetry and Polish- Very good.
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| Posted: 7/21/2007 9:55:48 PM | |
| P: 7/21/2007 10:39:29 PM | |
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denverappraiser Ideal Rock Total Posts: 4,614 Last Post: 11/22/2009 Member Since: 7/21/2004 |
GIA uses 13 parameters to calculate cut grade or round brilliant cut diamonds. Twelve are at http://www.facetware.gia.edu. The other two are polish and symmetry. To be 'excellent' you must score excellent on this, at least very good on polish and symmetry and not get dinged for painting or digging (which would result in a comment on the lab report. Yeah, I know that this means there are 14 parameters but I didn't invent the system, I'm just reporting on the party line. There's been LOTS of discussion on this here in the forum that you can find by a quick search for 'digging'). Neil Beaty GG(GIA) ICGA(AGS) NAJA Professional Appraisals in Denver There's never a crowd when you go that extra mile. |
| Posted: 7/21/2007 10:39:29 PM | |
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