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»  » Diamond Prices and Grading »
 » RockyTalky
»  » Steep Deep diamonds have lower face up color
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Steep Deep diamonds have lower face up color |
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| P: 6/17/2009 2:40:50 AM | |
Garry H (Cut Nut) Ideal Rock Total Posts: 11,582 Last Post: 11/24/2009 Member Since: 8/16/2000 |
It just occured to me, that the diamonds closer to the upper boundary of GIA's have lower color in the table leakage zone because of multiple ray paths bouncing around inside the stone in that area. Another good reason to change a bad system.
Garry Holloway FGAA DipDT HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au |
| Posted: 6/17/2009 2:40:50 AM | |
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There are 10 replies to this message. There are 10 replies on this page. |
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| P: 6/17/2009 2:54:45 AM | |
strmrdr Ideal Rock Total Posts: 23,296 Last Post: 10/9/2009 Member Since: 11/1/2003 |
depends on the lighting, but yes the light paths are longer so it will pick up more color. But in lighting where body color is actually an issue will it have an effect? Because if you are seeing diamond color the diamond isn't returning a lot of light. The majority of the time with a well cut RB for a fairly large range in body color it is irrelevant to what one will see. ........... Karl has joined the diamond trade and is now posting as Karl_K |
| Posted: 6/17/2009 2:54:45 AM | |
| P: 6/17/2009 3:09:55 AM | |
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strmrdr Ideal Rock Total Posts: 23,296 Last Post: 10/9/2009 Member Since: 11/1/2003 |
Same body color for both. DC tolk and 35.50/41.5 rest the same as DC tolk. Lighting ISO no head.  ........... Karl has joined the diamond trade and is now posting as Karl_K |
| Posted: 6/17/2009 3:09:55 AM | |
| P: 6/17/2009 3:25:19 AM | |
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strmrdr Ideal Rock Total Posts: 23,296 Last Post: 10/9/2009 Member Since: 11/1/2003 |
Same combos in simulated Marty type lighting. No color differences that can be attributed to absorption that I see.  ........... Karl has joined the diamond trade and is now posting as Karl_K |
| Posted: 6/17/2009 3:25:19 AM | |
| P: 6/18/2009 3:20:56 AM | |
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Garry H (Cut Nut) Ideal Rock Total Posts: 11,582 Last Post: 11/24/2009 Member Since: 8/16/2000 |
I am not sure what those images show Storm. But here you can see a slight difference. Both diamonds are the same weight. One is a VG sym real stone. When you do this the face up view should probably be what each eye will see - so I tilted 5 degrees. When we are looking for color, each eye will see some - just as when we look for fire, 2 eyes see more than one.  Garry Holloway FGAA DipDT |
| Posted: 6/18/2009 3:20:56 AM | |
| P: 6/18/2009 9:19:26 AM | |
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strmrdr Ideal Rock Total Posts: 23,296 Last Post: 10/9/2009 Member Since: 11/1/2003 |
Garry I am agreeing with you that it makes a slight difference. That the better cut diamond shows body color less often because it is being masked by light return is a much bigger difference than slight light path differences in my opinion. When we talk a radiant vs a RB then there is enough difference in the light path and brightness for there to be a more real world difference. ........... Karl has joined the diamond trade and is now posting as Karl_K |
| Posted: 6/18/2009 9:19:26 AM | |
| P: 6/18/2009 9:34:42 AM | |
John Pollard Ideal Rock Total Posts: 1,533 Last Post: 11/23/2009 Member Since: 5/1/2008 |
Hey Garry, I've been beating that drum since 2006. Nice that you're dancing to the beat now.  Date: 6/18/2009 9:19:26 AM Author: strmrdr When we talk a radiant vs a RB then there is enough difference in the light path and brightness for there to be a more real world difference. True that. Diamond cutters have known these tricks for a loooong time. It's the reason you'll find angle combos on colored stones the HCA would hate; since the idea in those cases is to keep the light path inside the diamond long enough to illuminate/exaggerate body color. John |
| Posted: 6/18/2009 9:34:42 AM | |
| P: 6/18/2009 12:24:04 PM | |
Kelli Ideal Rock Total Posts: 4,581 Last Post: 11/23/2009 Member Since: 5/27/2008 |
I know this isn't very technical, so delete if you like. But here are before and after pics of my stone, taken in the same room, facing the same direction, at the same time of day. Pic #1 is before the recut, GIA excellent with 35.5 CA and 41.2 PA.
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| Posted: 6/18/2009 12:24:04 PM | |
| P: 6/18/2009 12:27:43 PM | |
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Kelli Ideal Rock Total Posts: 4,581 Last Post: 11/23/2009 Member Since: 5/27/2008 |
Here is pic #2, after the recut. CA is 34.5 and PA is 40.7. 
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| Posted: 6/18/2009 12:27:43 PM | |
| P: 6/18/2009 12:32:13 PM | |
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Kelli Ideal Rock Total Posts: 4,581 Last Post: 11/23/2009 Member Since: 5/27/2008 |
It did actually go up a color grade too, but it was sent to the AGS instead of the GIA after the recut, so that may be why. It really does look a lot brighter and whiter now though. Even more than you can see in the pics, because they were lit up from behind.
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| Posted: 6/18/2009 12:32:13 PM | |
| P: 6/18/2009 2:46:05 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 |
Date: 6/18/2009 12:27:43 PM Its a great example Kelli - especially in the zone inside the table excluding the star pattern.
Author: Kelli Here is pic #2, after the recut. CA is 34.5 and PA is 40.7. Garry Holloway FGAA DipDT |
| Posted: 6/18/2009 2:46:05 PM | |
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