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»  » Diamond Prices and Grading »
 » RockyTalky
»  » HCA vs. Idealscope
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HCA vs. Idealscope |
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| P: 12/29/2005 3:38:30 PM | |
targa Rough Rock Total Posts: 50 Last Post: 2/6/2006 Member Since: 12/30/2004 |
if a diamond performs well on the HCA calculation is it possible still to have poor lperformance on the idealscope?
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| Posted: 12/29/2005 3:38:30 PM | |
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There are 6 replies to this message. There are 6 replies on this page. |
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| P: 12/29/2005 3:47:54 PM | |
strmrdr Ideal Rock Total Posts: 23,296 Last Post: 10/9/2009 Member Since: 11/1/2003 |
yes. the hca uses the averages and whats in the averages can be important. ........... Karl has joined the diamond trade and is now posting as Karl_K |
| Posted: 12/29/2005 3:47:54 PM | |
| P: 1/3/2006 1:48:54 PM | |
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targa Rough Rock Total Posts: 50 Last Post: 2/6/2006 Member Since: 12/30/2004 |
then is the converse true as well, nice idealscope with high hca number? if so, then IS images become more important in stone selection- how come so many vendors including some on PS don't use them?
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| Posted: 1/3/2006 1:48:54 PM | |
| P: 1/3/2006 1:52:17 PM | |
belle Ideal Rock Total Posts: 10,287 Last Post: 4/3/2008 Member Since: 11/19/2004 |
not all stones look so good under an idealscope
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| Posted: 1/3/2006 1:52:17 PM | |
| P: 1/3/2006 2:00:36 PM | |
Garry H (Cut Nut) Ideal Rock Total Posts: 11,582 Last Post: 11/24/2009 Member Since: 8/16/2000 |
IS wins over HCA Vendors need to have the stones in house to photograph them it is hard to find stones that look great under the ideal-scoppe Garry Holloway FGAA DipDT |
| Posted: 1/3/2006 2:00:36 PM | |
| P: 1/3/2006 2:31:09 PM | |
valeria101 Ideal Rock Total Posts: 14,048 Last Post: 4/30/2006 Member Since: 8/29/2003 |
Date: 1/3/2006 1:48:54 PM Author: targa then is the converse true as well, nice idealscope with high hca number? There are some... not too many. E.g. where painted or dug facets help light return under table (found one or two with HCA over 3 recently, they might still be in the database here); oter cases may happen - never tried to make a list of such things. if so, then IS images become more important in stone selection- how come so many vendors including some on PS don't use them? Typically, the stones ever presented with whatever details sound good about them - be it only lab reports (or not even) or a full bunch of bells and whistles  Ana "The greatest experts are only as good as the sum total of what they have seen." [Souren Melikian] |
| Posted: 1/3/2006 2:31:09 PM | |
| P: 1/3/2006 3:09:32 PM | |
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valeria101 Ideal Rock Total Posts: 14,048 Last Post: 4/30/2006 Member Since: 8/29/2003 |
The author of these images should know better if I am seeing things or what... Taking the meaning of the HCA scores and IS images as much as I understand them... these two seem to make a good example for your second question (about good IS and 'bad' HCA). I don't know waht exactly was modified about the cut to improve light return under the table to that point - the wider variation of girdle thickness hints to some twist of the pavilion facets (azimuth modification, 'painiting' or 'digging' as it was reffered to earlier on this forum), but I would rather not venture to guess. I am surely no expert - these looked interesting enough to mention. Hope you find them that way too   Ana "The greatest experts are only as good as the sum total of what they have seen." [Souren Melikian] |
| Posted: 1/3/2006 3:09:32 PM | |
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