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ť question about GIA's grading

question about GIA's grading

P: 5/9/2007 12:20:00 AM
MommaBear Cut Rock Total Posts: 480 Last Post: 7/14/2009 Member Since: 4/1/2007	i read "GIA's new system is similar to HCA but with symmetry, polish and minor facet data, but the data on GIA reports has been severely rounded. In order of importance: Pavilion 0.2°, Crown 0,5° lower girdle depth 5%. Steeper crown and deeper pavilion GIA graded 'Excellent' diamonds have a dark ring in the table area and will show the dirt on the pavilion." so if the stone that I'm looking at is graded 'excellent' by GIA, it might have a dark ring? and what does dirt on the pavilion mean? thanks for any info
Posted: 5/9/2007 12:20:00 AM

There are 4 replies to this message. There are 4 replies on this page.

P: 5/9/2007 12:27:22 AM
JulieN Ideal Rock Total Posts: 7,148 Last Post: 11/23/2009 Member Since: 7/25/2005	If the stone exhibits the "ring of death" then that means it's a dead spot, and you can see clear through the stone, as well as the dirt on the other side.
Posted: 5/9/2007 12:27:22 AM

P: 5/9/2007 12:30:47 AM
MommaBear Cut Rock Total Posts: 480 Last Post: 7/14/2009 Member Since: 4/1/2007	thanks for the info
Posted: 5/9/2007 12:30:47 AM

P: 5/9/2007 1:37:33 AM
surfgirl Ideal Rock Total Posts: 4,438 Last Post: 5/19/2009 Member Since: 4/5/2007	Wait,so a "ring of death" is a good thing?
Posted: 5/9/2007 1:37:33 AM

P: 5/9/2007 7:06:31 AM
Regular Guy Ideal Rock Total Posts: 5,317 Last Post: 11/23/2009 Member Since: 7/7/2004	Date: 5/9/2007 1:37:33 AM Author: surfgirl Wait,so a 'ring of death' is a good thing? Almost as good as ring around the collar! No, wait. Run the HCA, accepting the defaults, and hit "go." See the big box that is the GIA excellent outline? half is in good territory, and only 1/2 in bad. Good is still good. In fact, per reports from the HCA author, perhaps what is now 1/2 and 1/2 will become 2/3 and 1/3. But even then, still 1/3 will remain bad, and that is not the good thing that is the ring of death. Ring of death is not a good thing. Ira (Ruffles have Ridges) Z. ____________ If you're looking for diamond shopping tips...this (along with this update) might do the trick! however...caution: known to have been regarded as armed and dangerous
Posted: 5/9/2007 7:06:31 AM

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