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 » RockyTalky
»  » Freak diamonds...
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Freak diamonds... |
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| P: 4/18/2002 10:04:16 PM | |
muddy guy Rough Rock Total Posts: 17 Last Post: 5/12/2002 Member Since: 4/9/2002 |
Okay, here's what I'd like to know... Have any of you experts, or experienced consumers out there ran a stone through the HCA, had it get a great rating (less than 1?), then upon actually viewing the stone decided it was not a good performer at all? Dull? Lifeless? Ugly? Huh? I know you don't proclaim the HCA to be an acid test, but what have you experienced? Muddy
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| Posted: 4/18/2002 10:04:16 PM | |
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There are 7 replies to this message. There are 7 replies on this page. |
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| P: 4/19/2002 8:30:48 AM | |
oldminer Ideal Rock Total Posts: 4,966 Last Post: 11/24/2009 Member Since: 9/4/2000 |
I have had no surprises..... The Ideal-Scope also allows no surprises. The HCA is an excellent indicator of performance.
David S. Atlas |
| Posted: 4/19/2002 8:30:48 AM | |
| P: 4/19/2002 8:40:22 AM | |
Pricescope Administrator Total Posts: 8,265 Last Post: 1/5/2008 Member Since: 1/1/2000 |
I think it's also a matter of taste and illumination conditions. I've heard that inexperienced buyers were not able to see a difference between HCA excellent and very good in office environment. Some light leaking diamonds look nice while loose but not as good when set. Pricescope |
| Posted: 4/19/2002 8:40:22 AM | |
| P: 4/20/2002 4:42:23 AM | |
Garry H (Cut Nut) Ideal Rock Total Posts: 11,586 Last Post: 11/25/2009 Member Since: 8/16/2000 |
A couple of comments. 1. HCA does not see the stone and can not know about the symmetry. Some non symetric stones can look better, but most look worse. 2. If a diamond is on the shallow side and has very short pavilion mains it can appear very dark and lifeless. This is uncommon, but does happen. 3. We saw a stone the other day that was a dreadful anomally - it had very steep upper girdle facets - but an ideal-scope peek told us not to buy it. Both these latter occurences are 1 in a 1000. 4. Were you looking at unset diamonds held in tweezers? HCA assumes no light can enter the pavilion, where as many diamonds 'experts' do all their analysis with loose diamonds and are fooled by light leaking from behind the pavilion in diamonds that die when set. The moral is hCA is a fantastic preselection tool, but we strongly recomend you use an appraiser or at the very least get an ideal-scope. Garry Holloway FGAA DipDT |
| Posted: 4/20/2002 4:42:23 AM | |
| P: 4/20/2002 2:30:08 PM | |
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muddy guy Rough Rock Total Posts: 17 Last Post: 5/12/2002 Member Since: 4/9/2002 |
Okay, how about this stone, which measures up an awesome .3 ex-ex-ex-ex on HAC, but only has good symmetry? Waddaya think? Shape and Cutting Style Round Brilliant Measurements 6.53-6.59x3.92 Weight 1.01 Cts. Proportions Depth 59.8 % Table 58 % Girdle Thin to Medium Culet None Finish Polish Excellent Symmetry Good Clarity Grade VS2 Characteristics Color Grade H Fluorescence none 
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| Posted: 4/20/2002 2:30:08 PM | |
| P: 4/20/2002 6:08:10 PM | |
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Pricescope Administrator Total Posts: 8,265 Last Post: 1/5/2008 Member Since: 1/1/2000 |
Looking very nice 
Pricescope |
| Posted: 4/20/2002 6:08:10 PM | |
| P: 4/21/2002 9:46:44 PM | |
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muddy guy Rough Rock Total Posts: 17 Last Post: 5/12/2002 Member Since: 4/9/2002 |
Oh, good! Thanks so much for your reply, Leonid. Oh, by the way, I forgot to include the actual Sarin data, in case anyone can spot a problem that the HCA might not? depth: 59.9% table: 58% crown.ang: 33.0 deg crown height: 14.0% ---0.92 mm pavil.ang:40.9 deg pavil.depth: 42.9% culet:1.1% girdle: 0.76% - 1.37% Starting to feel better and better about this SCARY purchase! 
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| Posted: 4/21/2002 9:46:44 PM | |
| P: 4/21/2002 9:51:06 PM | |
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Pricescope Administrator Total Posts: 8,265 Last Post: 1/5/2008 Member Since: 1/1/2000 |
It souds like very nice stone. Plug the Sarin data into Cut Adviser.
Pricescope |
| Posted: 4/21/2002 9:51:06 PM | |
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