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 » RockyTalky
»  » How does a recently graded AGS000 get a 3.4 on the HCA??
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How does a recently graded AGS000 get a 3.4 on the HCA?? |
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| P: 6/18/2007 5:06:55 PM | |
angeline Ideal Rock Total Posts: 1,942 Last Post: 11/14/2009 Member Since: 7/23/2006 |
What gives here? Who do I believe? Would this be a good stone or not? Depth: 62 Table: 55.4 Crown: 34.9 Pav: 41.2 It was graded AGS Ideal 0 this year, but gets a 3.4, VG, G, G, VG on the HCA. Anyone know why? Thanks, a
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| Posted: 6/18/2007 5:06:55 PM | |
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There are 6 replies to this message. There are 6 replies on this page. |
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| P: 6/18/2007 5:25:07 PM | |
Pricescope Administrator Total Posts: 8,265 Last Post: 1/5/2008 Member Since: 1/1/2000 |
HCA penalizes for the light leakage. This stone has a bit deep pavilion and can have light leakage under the table. You can download Gem Adviser (free program with numerous examples) and see this effect on the closest model. Pricescope |
| Posted: 6/18/2007 5:25:07 PM | |
| P: 6/18/2007 5:28:03 PM | |
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angeline Ideal Rock Total Posts: 1,942 Last Post: 11/14/2009 Member Since: 7/23/2006 |
Thanks Pricescope! I just don't get how AGS can rate the light performance as Ideal if it might have leakage under the table? I'll go look up that linky  a ETA: darn it I just looked and it's only for Windows - I've got a mac
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| Posted: 6/18/2007 5:28:03 PM | |
| P: 6/18/2007 10:21:46 PM | |
ladyciel Ideal Rock Total Posts: 1,376 Last Post: 11/22/2009 Member Since: 3/24/2007 |
This table shows the thumbnails for the idealscope images GemScope would produce. They aren't very big, but you CAN begin to see the lighter/whiter table beginning to appear in the range of crown and pavillion angles for the diamond you listed.
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| Posted: 6/18/2007 10:21:46 PM | |
| P: 6/19/2007 12:20:53 AM | |
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angeline Ideal Rock Total Posts: 1,942 Last Post: 11/14/2009 Member Since: 7/23/2006 |
Date: 6/18/2007 10:21:46 PM Author: ladyciel This table shows the thumbnails for the idealscope images GemScope would produce. They aren't very big, but you CAN begin to see the lighter/whiter table beginning to appear in the range of crown and pavillion angles for the diamond you listed. Thanks ladyciel! That was very helpful. a
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| Posted: 6/19/2007 12:20:53 AM | |
| P: 6/19/2007 8:00:18 AM | |
oldminer Ideal Rock Total Posts: 4,964 Last Post: 11/20/2009 Member Since: 9/4/2000 |
AGS is making a "category" which does include a variety of good looking diamonds. Who knows without close personal observation which one you might prefer. You'll find all AGS 0 diamonds attractive. The question is, Which one do you prefer. All top quality diamonds, regardless of the system, are not idential or totally equal. There is a range of the best. Some labs have tighter categories and some looser categories. Its personaol preference with a regard to budget and price which control the final decision. David S. Atlas |
| Posted: 6/19/2007 8:00:18 AM | |
| P: 6/19/2007 1:35:27 PM | |
JohnQuixote Ideal Rock Total Posts: 5,212 Last Post: 5/24/2008 Member Since: 9/9/2004 |
Date: 6/19/2007 8:00:18 AM Author: oldminer All top quality diamonds, regardless of the system, are not idential or totally equal. There is a range of the best. Some labs have tighter categories and some looser categories. Its personaol preference with a regard to budget and price which control the final decision. Precisely. The HCA, AGA, AGS and GIA all differ slightly but there is strong overlap in recommended/top configurations. For instance, let's take preferred pavilion angles: For 53-58% tables, pavilion angles of 40.6-41.0 have the greatest approval cross-system. The AGS cut guidelines cite most candidates for 0 in that range. The HCA and AGA prefer the shallow side (and a bit lower). GIA prefers the steep side (and higher). The prediction depends on overall configuration of course, but it's nice that strong overlap exists. John |
| Posted: 6/19/2007 1:35:27 PM | |
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