|
|
|
|
| ||
Diamond Jewelry Forums
 Picture Gallery
 Video Gallery
 Journal
|
|||
|
|  Search
|  Posted Today
|  Most Active
|  Help
|
||
 »
Home
»  » Diamond Prices and Grading »
 » RockyTalky
»  » Stone dark in the middle
|
|
 |
Stone dark in the middle |
 |
| P: 8/9/2007 1:46:03 PM | |
paulyg Rough Rock Total Posts: 2 Last Post: 8/9/2007 Member Since: 8/9/2007 |
Newbie here. Been lurking (and learning) some. Went to a local B&M yesterday and one of the stones I was shown seemed to have a "dark" area in the middle when it was sitting on the tissue paper and on the display case. Is this normal? Was it just b/c of the particular light situation? OR does a dark center mean the depth% is too much (paviion angle too high)? It was a princess so the table depth stuff is more complicatd and subjective. I just want to learn. I looked at the reported table and depth %s but can't remember exactly what they were. They were both in the lower 70% range. I had my idealscope in my pocket but was afraid to take it out and use it. They didn't have what I was looking for anyways. |
| Posted: 8/9/2007 1:46:03 PM | |
|
There are 6 replies to this message. There are 6 replies on this page. |
|
| P: 8/9/2007 1:57:32 PM | |
neatfreak Ideal Rock Total Posts: 13,470 Last Post: 11/24/2009 Member Since: 2/17/2007 |
I don't really know the answer, but it could have been something obstructing the light, like your head. But there are a TON of really badly cut princesses out there, so it could have just been really bad light leakage...
|
| Posted: 8/9/2007 1:57:32 PM | |
| P: 8/9/2007 2:39:37 PM | |
Chrono Ideal Rock Total Posts: 11,338 Last Post: 11/24/2009 Member Since: 4/22/2004 |
I can only think of 2 reasons: 1. Head obstruction: when viewed up close, your head creates a shadow thus the dark area is seen in the diamond. This effect will go away when the diamond is viewed further away 2. Badly cut: no resolution unless the stone is recut.
|
| Posted: 8/9/2007 2:39:37 PM | |
| P: 8/9/2007 4:01:24 PM | |
gwendolyn Ideal Rock Total Posts: 6,544 Last Post: 11/12/2009 Member Since: 8/4/2007 |
Did it look like this? http://www.pricescope.com/idealbb/view.asp?topicID=21400 If so it seems like it would've been due to the cut. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| Posted: 8/9/2007 4:01:24 PM | |
| P: 8/9/2007 9:06:29 PM | |
Breezee Rough Rock Total Posts: 48 Last Post: 12/1/2007 Member Since: 8/2/2007 |
Date: 8/9/2007 4:01:24 PM Author: gwendolyn Did it look like this? http://www.pricescope.com/idealbb/view.asp?topicID=21400 If so it seems like it would've been due to the cut. How deep is "too deep" as far as the pavillion is concerned on princess cut diamonds to avoid this dark spot??
|
| Posted: 8/9/2007 9:06:29 PM | |
| P: 8/9/2007 9:22:42 PM | |
Garry H (Cut Nut) Ideal Rock Total Posts: 11,583 Last Post: 11/24/2009 Member Since: 8/16/2000 |
The nail head affect caused by an observers head blocking or obstructing light sources rarely if ever happens in a princess cut - in fact there is usually not enough of it in poorly cut stones to add contrast. It is very likely the stone had a lot of leakage. Garry Holloway FGAA DipDT |
| Posted: 8/9/2007 9:22:42 PM | |
| P: 8/9/2007 10:06:27 PM | |
|
paulyg Rough Rock Total Posts: 2 Last Post: 8/9/2007 Member Since: 8/9/2007 |
Cool. That means I made the right decision. 
|
| Posted: 8/9/2007 10:06:27 PM | |
 Previous Page
|
Next Page 
|
Contact Us | Back Home | Privacy Statement | Forum Agreement | Forum Policies | |
| Ideal BB Version: 0.1.5.4.beta1 | Message forum software powered by the Ideal BB |
| |
Pricescope -
Knowledge -
Diamond Prices -
Tools -
Resources -
About
© 2000-2009 Pricescope. Terms of Use Privacy Policy Disclaimer
forum archives
