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»  » Diamond Prices and Grading »
 » RockyTalky
»  » Excellent Symmetry on GIA but low HCA Score
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Excellent Symmetry on GIA but low HCA Score |
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| P: 3/4/2005 6:09:53 PM | |
moreblingplease Rough Rock Total Posts: 3 Last Post: 3/4/2005 Member Since: 2/17/2005 |
I've been looking at a lot of diamond in the past month and found this diamond which is GIA certified. From the certification the table and depth are within the Ideal Cut parameters. But when I got the Sarin Report numbers, the HCA scored pretty bad. But the GIA certificate has a very good polish and an excellent symmetry. So now I'm confused  ? Is this diamond ideal or not?This is the sarin report number. Diam: 9.56 ( 9.54-9.58 x 5.89) Depth: 61.6% Crown: 33.8 13.6% Pavilion: 43.1 44.1% 1 Table: 5.52mm 57.7% 1 Culet: 0.3% None 0 Girdle 1.2% ( 0.3-2.3) % Any advice would be appreciated. |
| Posted: 3/4/2005 6:09:53 PM | |
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There are 7 replies to this message. There are 7 replies on this page. |
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| P: 3/4/2005 6:18:01 PM | |
Wink Ideal Rock Total Posts: 4,033 Last Post: 11/24/2009 Member Since: 5/4/2001 |
This stone is slightly outside the parameters of an ideal cut stone and would more properly be considered a premium cut by many. While the crown angle is within the parameters of the ideal cut stone, the crown is a little shallow the pavilion angle is too steep and the pavilion is too deep. This stone will look nice, but not when seen next to a truly well cut diamond. The table is also just over the edge of the 57% that most consider the limit, although feel it should be at 57.5% Wink Wink Jones |
| Posted: 3/4/2005 6:18:01 PM | |
| P: 3/4/2005 6:24:02 PM | |
Garry H (Cut Nut) Ideal Rock Total Posts: 11,582 Last Post: 11/24/2009 Member Since: 8/16/2000 |
That data is for a diamond that can not exist. There are typo's or the scanner was the worst I ever saw.  Garry Holloway FGAA DipDT |
| Posted: 3/4/2005 6:24:02 PM | |
| P: 3/4/2005 8:46:19 PM | |
solange Ideal Rock Total Posts: 871 Last Post: 8/23/2008 Member Since: 2/20/2004 |
I posted this question on another thread and did not get any response. Since it is related to the above topic I am posting it here too.
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| Posted: 3/4/2005 8:46:19 PM | |
| P: 3/4/2005 9:22:58 PM | |
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Garry H (Cut Nut) Ideal Rock Total Posts: 11,582 Last Post: 11/24/2009 Member Since: 8/16/2000 |
You also have very poor scan data - 14.4% crown height with a 56% table must have a 33.2 crown angle. \Or if the crown angle is correct the table size is 58.1%. The girdle thickness can be measured at the valley or thin part and 1.8% would be extremely thin. 1.8% at the thick bezel juntion on the girdle is medium to slightly thick border. Your stone is shallow and the angles are not - so I suggest you get an appraiser to check the data. Also Ogi is the least reliable scanner of the 3 on the market. The data stinks. I think if you have a stone with those GIA #'s then your stone is likely to have a low crown and low pavilion angle. Something is fishy Garry Holloway FGAA DipDT |
| Posted: 3/4/2005 9:22:58 PM | |
| P: 3/4/2005 9:42:28 PM | |
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solange Ideal Rock Total Posts: 871 Last Post: 8/23/2008 Member Since: 2/20/2004 |
The Sarin is as follows: GIA Graded 4.10 Depth 59.9 Table 56.7 Crown angle 34.3 pav. angle 40.6 crown height 14.7 girdle medium culet pointed AGS proportion grade 0 This is the information I got from the Pricescope vendor. Is this still way off?
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| Posted: 3/4/2005 9:42:28 PM | |
| P: 3/4/2005 11:12:43 PM | |
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Garry H (Cut Nut) Ideal Rock Total Posts: 11,582 Last Post: 11/24/2009 Member Since: 8/16/2000 |
Solange this stone is completely different to your previous data. It should be very beautiful. It makes a nice DiamCalc image. The other proportions were impossible for a closed 3D object. Garry Holloway FGAA DipDT |
| Posted: 3/4/2005 11:12:43 PM | |
| P: 3/4/2005 11:36:31 PM | |
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solange Ideal Rock Total Posts: 871 Last Post: 8/23/2008 Member Since: 2/20/2004 |
Garry, Thank you for your efforts. The first set of numbers was from the OGI. I guess the Sarin is more accurate. Anyway I am very relieved. You are a great asset to this Forum and I appreciate your frank and open way of telling it as it is. Your input is of great help to so many confused buyers like myself. And of course I am very relieved to find that my stone was as described by the pricescope vendor.
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| Posted: 3/4/2005 11:36:31 PM | |
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