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»  » Diamond Prices and Grading »
 » RockyTalky
»  » Cut Rating or HCA Score?
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Cut Rating or HCA Score? |
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| P: 12/11/2008 2:29:23 AM | |
supalong52 Rough Rock Total Posts: 1 Last Post: 12/11/2008 Member Since: 12/11/2008 |
I was browsing diamonds on jamesallen.com and I came across a stone that was rated GIA very good. I put the dimensions into the HCA calculator and it returned a 0.6, which I understand is very good. I was wondering if, when choosing a diamond, I should narrow it down to an AGS0 first, then find something with a good HCA score, or if a good HCA score is good enough regardless of cut rating. Unfortunately, I lost the link so I can't post detailed stats. It was probably G, VS2, 1.2ish.
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| Posted: 12/11/2008 2:29:23 AM | |
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There are 5 replies to this message. There are 5 replies on this page. |
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| P: 12/11/2008 3:05:28 AM | |
Stone-cold11 Ideal Rock Total Posts: 6,882 Last Post: 11/23/2009 Member Since: 9/9/2008 |
Need to see the actual dimensions, but I would go with HCA than with cut ratings of vendors or GIA. The only cut ratings I trust are AGS DQD cut ratings.
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| Posted: 12/11/2008 3:05:28 AM | |
| P: 12/11/2008 3:16:10 AM | |
Garry H (Cut Nut) Ideal Rock Total Posts: 11,579 Last Post: 11/23/2009 Member Since: 8/16/2000 |
after you run HCA a warning comes up under the box and it links here http://diamonds.pricescope.com/ideal.asp  Read this and you will understand a lot more 
Garry Holloway FGAA DipDT |
| Posted: 12/11/2008 3:16:10 AM | |
| P: 12/11/2008 4:16:55 AM | |
Lorelei Ideal Rock Total Posts: 34,227 Last Post: 11/23/2009 Member Since: 4/30/2005 |
Date: 12/11/2008 2:29:23 AM Author:supalong52 I was browsing diamonds on jamesallen.com and I came across a stone that was rated GIA very good. I put the dimensions into the HCA calculator and it returned a 0.6, which I understand is very good. I was wondering if, when choosing a diamond, I should narrow it down to an AGS0 first, then find something with a good HCA score, or if a good HCA score is good enough regardless of cut rating. Unfortunately, I lost the link so I can't post detailed stats. It was probably G, VS2, 1.2ish. An Idealscope image would be very useful in this case. Depending on what you are looking for, use the HCA to eliminate the lesser performers leaving you with the ones which score 2 or below. Then from the ones you like best out of those, request Idealscope images to narrow the field.  Nothing is more sacred as the bond between horse and rider...no other creature can ever become so emotionally close to a human as a horse. When a horse dies, the memory lives on because an enormous part of his owner's heart, soul, very existence dies also...but that can never be laid to rest, it is not meant to be... - Stephanie M Thorn |
| Posted: 12/11/2008 4:16:55 AM | |
| P: 12/11/2008 9:11:19 AM | |
neatfreak Ideal Rock Total Posts: 13,450 Last Post: 11/23/2009 Member Since: 2/17/2007 |
Date: 12/11/2008 4:16:55 AM Author: Lorelei Date: 12/11/2008 2:29:23 AM Author:supalong52 I was browsing diamonds on jamesallen.com and I came across a stone that was rated GIA very good. I put the dimensions into the HCA calculator and it returned a 0.6, which I understand is very good. I was wondering if, when choosing a diamond, I should narrow it down to an AGS0 first, then find something with a good HCA score, or if a good HCA score is good enough regardless of cut rating. Unfortunately, I lost the link so I can't post detailed stats. It was probably G, VS2, 1.2ish. An Idealscope image would be very useful in this case. Depending on what you are looking for, use the HCA to eliminate the lesser performers leaving you with the ones which score 2 or below. Then from the ones you like best out of those, request Idealscope images to narrow the field. Well said...a low score doesn't **guarantee** a good performer. It just means it should be considered so keep that in mind.
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| Posted: 12/11/2008 9:11:19 AM | |
| P: 12/11/2008 10:29:58 AM | |
Paul-Antwerp Ideal Rock Total Posts: 1,907 Last Post: 11/23/2009 Member Since: 9/3/2002 |
Very well said, neatfreak. To explain a bit more, the HCA uses 4 averages of measurements, in order to assess a round. Using averages is never the same as assessing the real stone, and a lot of extra information might be hidden in the averages. As a comparison, one can look at the GIA cut-grade-system. It is in some ways more refined because it works with more data, albeit all are also averages. It thus has the same limitations as the HCA. And in a way, the HCA looks a bit more sophisticated, since it gives a number between 0.1 and 9.9, while GIA only has 5 cut-categories. Considering the limitations of using averages, one should however not get over-involved in the exact number produced by the HCA. It is a possible best score of the stone, if all details have been cut extremely symmetrically. Since nobody knows, one needs to look more into detail if the score is good enough, for instance by looking at the ideal-scope or the ASET. Live long, Paul Slegers |
| Posted: 12/11/2008 10:29:58 AM | |
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